Add `readonly` to C# methods and types that don't mutate

Also removes a few unnecessary temp variables

26 files changed, 445 insertions, 450 deletions

diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/GodotMemberData.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/GodotMemberData.cs
index db395e21cb..abd8079922 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/GodotMemberData.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/GodotMemberData.cs
@@ -3,7 +3,7 @@ using Microsoft.CodeAnalysis;
 
 namespace Godot.SourceGenerators
 {
-    public struct GodotMethodData
+    public readonly struct GodotMethodData
     {
         public GodotMethodData(IMethodSymbol method, ImmutableArray<MarshalType> paramTypes,
             ImmutableArray<ITypeSymbol> paramTypeSymbols, MarshalType? retType, ITypeSymbol? retSymbol)
@@ -22,7 +22,7 @@ namespace Godot.SourceGenerators
         public ITypeSymbol? RetSymbol { get; }
     }
 
-    public struct GodotSignalDelegateData
+    public readonly struct GodotSignalDelegateData
     {
         public GodotSignalDelegateData(string name, INamedTypeSymbol delegateSymbol, GodotMethodData invokeMethodData)
         {
@@ -36,7 +36,7 @@ namespace Godot.SourceGenerators
         public GodotMethodData InvokeMethodData { get; }
     }
 
-    public struct GodotPropertyData
+    public readonly struct GodotPropertyData
     {
         public GodotPropertyData(IPropertySymbol propertySymbol, MarshalType type)
         {
@@ -48,7 +48,7 @@ namespace Godot.SourceGenerators
         public MarshalType Type { get; }
     }
 
-    public struct GodotFieldData
+    public readonly struct GodotFieldData
     {
         public GodotFieldData(IFieldSymbol fieldSymbol, MarshalType type)
         {
diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/MethodInfo.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/MethodInfo.cs
index 81c6f2b7d5..bb9be862c4 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/MethodInfo.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/MethodInfo.cs
@@ -2,7 +2,7 @@ using System.Collections.Generic;
 
 namespace Godot.SourceGenerators
 {
-    internal struct MethodInfo
+    internal readonly struct MethodInfo
     {
         public MethodInfo(string name, PropertyInfo returnVal, MethodFlags flags,
             List<PropertyInfo>? arguments,
diff --git a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/PropertyInfo.cs b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/PropertyInfo.cs
index b345f5f84d..2b89633ef6 100644
--- a/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/PropertyInfo.cs
+++ b/modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/PropertyInfo.cs
@@ -1,6 +1,6 @@
 namespace Godot.SourceGenerators
 {
-    internal struct PropertyInfo
+    internal readonly struct PropertyInfo
     {
         public PropertyInfo(VariantType type, string name, PropertyHint hint,
             string? hintString, PropertyUsageFlags usage, bool exported)
diff --git a/modules/mono/editor/GodotTools/GodotTools.IdeMessaging/Utils/SemaphoreExtensions.cs b/modules/mono/editor/GodotTools/GodotTools.IdeMessaging/Utils/SemaphoreExtensions.cs
index 9d593fbf8a..ab21527344 100644
--- a/modules/mono/editor/GodotTools/GodotTools.IdeMessaging/Utils/SemaphoreExtensions.cs
+++ b/modules/mono/editor/GodotTools/GodotTools.IdeMessaging/Utils/SemaphoreExtensions.cs
@@ -13,7 +13,7 @@ namespace GodotTools.IdeMessaging.Utils
             return waitAsyncTask.ContinueWith<IDisposable>(t => wrapper, cancellationToken).ConfigureAwait(false);
         }
 
-        private struct SemaphoreSlimWaitReleaseWrapper : IDisposable
+        private readonly struct SemaphoreSlimWaitReleaseWrapper : IDisposable
         {
             private readonly SemaphoreSlim semaphoreSlim;
 
diff --git a/modules/mono/editor/GodotTools/GodotTools/Export/AotBuilder.cs b/modules/mono/editor/GodotTools/GodotTools/Export/AotBuilder.cs
index 2184cae6d6..94efcba3f1 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Export/AotBuilder.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Export/AotBuilder.cs
@@ -22,7 +22,7 @@ namespace GodotTools.Export
         public bool FullAot;
 
         private bool _useInterpreter;
-        public bool UseInterpreter { get => _useInterpreter && !LLVMOnly; set => _useInterpreter = value; }
+        public bool UseInterpreter { readonly get => _useInterpreter && !LLVMOnly; set => _useInterpreter = value; }
 
         public string[] ExtraAotOptions;
         public string[] ExtraOptimizerOptions;
diff --git a/modules/mono/editor/GodotTools/GodotTools/PlaySettings.cs b/modules/mono/editor/GodotTools/GodotTools/PlaySettings.cs
index 820d0c0b83..9a8fdcc7c5 100644
--- a/modules/mono/editor/GodotTools/GodotTools/PlaySettings.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/PlaySettings.cs
@@ -1,6 +1,6 @@
 namespace GodotTools
 {
-    public struct PlaySettings
+    public readonly struct PlaySettings
     {
         public bool HasDebugger { get; }
         public string DebuggerHost { get; }
diff --git a/modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/CallbacksInfo.cs b/modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/CallbacksInfo.cs
index 686023a077..ae51c07386 100644
--- a/modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/CallbacksInfo.cs
+++ b/modules/mono/glue/GodotSharp/Godot.SourceGenerators.Internal/CallbacksInfo.cs
@@ -4,7 +4,7 @@ using Microsoft.CodeAnalysis;
 
 namespace Godot.SourceGenerators.Internal;
 
-internal struct CallbacksData
+internal readonly struct CallbacksData
 {
     public CallbacksData(INamedTypeSymbol nativeTypeSymbol, INamedTypeSymbol funcStructSymbol)
     {
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/AABB.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/AABB.cs
index d8a6644a66..a2916d4ae8 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/AABB.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/AABB.cs
@@ -20,7 +20,7 @@ namespace Godot
         /// <value>Directly uses a private field.</value>
         public Vector3 Position
         {
-            get { return _position; }
+            readonly get { return _position; }
             set { _position = value; }
         }
 
@@ -31,7 +31,7 @@ namespace Godot
         /// <value>Directly uses a private field.</value>
         public Vector3 Size
         {
-            get { return _size; }
+            readonly get { return _size; }
             set { _size = value; }
         }
 
@@ -45,7 +45,7 @@ namespace Godot
         /// </value>
         public Vector3 End
         {
-            get { return _position + _size; }
+            readonly get { return _position + _size; }
             set { _size = value - _position; }
         }
 
@@ -54,7 +54,7 @@ namespace Godot
         /// the most-negative corner is the origin and the size is positive.
         /// </summary>
         /// <returns>The modified <see cref="AABB"/>.</returns>
-        public AABB Abs()
+        public readonly AABB Abs()
         {
             Vector3 end = End;
             Vector3 topLeft = new Vector3(Mathf.Min(_position.x, end.x), Mathf.Min(_position.y, end.y), Mathf.Min(_position.z, end.z));
@@ -66,7 +66,7 @@ namespace Godot
         /// to <see cref="Position"/> + (<see cref="Size"/> / 2).
         /// </summary>
         /// <returns>The center.</returns>
-        public Vector3 GetCenter()
+        public readonly Vector3 GetCenter()
         {
             return _position + (_size * 0.5f);
         }
@@ -78,7 +78,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not this <see cref="AABB"/> encloses <paramref name="with"/>.
         /// </returns>
-        public bool Encloses(AABB with)
+        public readonly bool Encloses(AABB with)
         {
             Vector3 srcMin = _position;
             Vector3 srcMax = _position + _size;
@@ -98,7 +98,7 @@ namespace Godot
         /// </summary>
         /// <param name="point">The point to include.</param>
         /// <returns>The expanded <see cref="AABB"/>.</returns>
-        public AABB Expand(Vector3 point)
+        public readonly AABB Expand(Vector3 point)
         {
             Vector3 begin = _position;
             Vector3 end = _position + _size;
@@ -140,7 +140,7 @@ namespace Godot
         /// <paramref name="idx"/> is less than 0 or greater than 7.
         /// </exception>
         /// <returns>An endpoint of the <see cref="AABB"/>.</returns>
-        public Vector3 GetEndpoint(int idx)
+        public readonly Vector3 GetEndpoint(int idx)
         {
             switch (idx)
             {
@@ -172,7 +172,7 @@ namespace Godot
         /// Returns the normalized longest axis of the <see cref="AABB"/>.
         /// </summary>
         /// <returns>A vector representing the normalized longest axis of the <see cref="AABB"/>.</returns>
-        public Vector3 GetLongestAxis()
+        public readonly Vector3 GetLongestAxis()
         {
             var axis = new Vector3(1f, 0f, 0f);
             real_t maxSize = _size.x;
@@ -195,7 +195,7 @@ namespace Godot
         /// Returns the <see cref="Vector3.Axis"/> index of the longest axis of the <see cref="AABB"/>.
         /// </summary>
         /// <returns>A <see cref="Vector3.Axis"/> index for which axis is longest.</returns>
-        public Vector3.Axis GetLongestAxisIndex()
+        public readonly Vector3.Axis GetLongestAxisIndex()
         {
             var axis = Vector3.Axis.X;
             real_t maxSize = _size.x;
@@ -218,7 +218,7 @@ namespace Godot
         /// Returns the scalar length of the longest axis of the <see cref="AABB"/>.
         /// </summary>
         /// <returns>The scalar length of the longest axis of the <see cref="AABB"/>.</returns>
-        public real_t GetLongestAxisSize()
+        public readonly real_t GetLongestAxisSize()
         {
             real_t maxSize = _size.x;
 
@@ -235,7 +235,7 @@ namespace Godot
         /// Returns the normalized shortest axis of the <see cref="AABB"/>.
         /// </summary>
         /// <returns>A vector representing the normalized shortest axis of the <see cref="AABB"/>.</returns>
-        public Vector3 GetShortestAxis()
+        public readonly Vector3 GetShortestAxis()
         {
             var axis = new Vector3(1f, 0f, 0f);
             real_t maxSize = _size.x;
@@ -258,7 +258,7 @@ namespace Godot
         /// Returns the <see cref="Vector3.Axis"/> index of the shortest axis of the <see cref="AABB"/>.
         /// </summary>
         /// <returns>A <see cref="Vector3.Axis"/> index for which axis is shortest.</returns>
-        public Vector3.Axis GetShortestAxisIndex()
+        public readonly Vector3.Axis GetShortestAxisIndex()
         {
             var axis = Vector3.Axis.X;
             real_t maxSize = _size.x;
@@ -281,7 +281,7 @@ namespace Godot
         /// Returns the scalar length of the shortest axis of the <see cref="AABB"/>.
         /// </summary>
         /// <returns>The scalar length of the shortest axis of the <see cref="AABB"/>.</returns>
-        public real_t GetShortestAxisSize()
+        public readonly real_t GetShortestAxisSize()
         {
             real_t maxSize = _size.x;
 
@@ -300,7 +300,7 @@ namespace Godot
         /// </summary>
         /// <param name="dir">The direction to find support for.</param>
         /// <returns>A vector representing the support.</returns>
-        public Vector3 GetSupport(Vector3 dir)
+        public readonly Vector3 GetSupport(Vector3 dir)
         {
             Vector3 halfExtents = _size * 0.5f;
             Vector3 ofs = _position + halfExtents;
@@ -315,7 +315,7 @@ namespace Godot
         /// Returns the volume of the <see cref="AABB"/>.
         /// </summary>
         /// <returns>The volume.</returns>
-        public real_t GetVolume()
+        public readonly real_t GetVolume()
         {
             return _size.x * _size.y * _size.z;
         }
@@ -325,7 +325,7 @@ namespace Godot
         /// </summary>
         /// <param name="by">The amount to grow by.</param>
         /// <returns>The grown <see cref="AABB"/>.</returns>
-        public AABB Grow(real_t by)
+        public readonly AABB Grow(real_t by)
         {
             AABB res = this;
 
@@ -347,7 +347,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="AABB"/> contains <paramref name="point"/>.
         /// </returns>
-        public bool HasPoint(Vector3 point)
+        public readonly bool HasPoint(Vector3 point)
         {
             if (point.x < _position.x)
                 return false;
@@ -374,7 +374,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="AABB"/> has surface.
         /// </returns>
-        public bool HasSurface()
+        public readonly bool HasSurface()
         {
             return _size.x > 0.0f || _size.y > 0.0f || _size.z > 0.0f;
         }
@@ -388,7 +388,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="AABB"/> has volume.
         /// </returns>
-        public bool HasVolume()
+        public readonly bool HasVolume()
         {
             return _size.x > 0.0f && _size.y > 0.0f && _size.z > 0.0f;
         }
@@ -398,7 +398,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other <see cref="AABB"/>.</param>
         /// <returns>The clipped <see cref="AABB"/>.</returns>
-        public AABB Intersection(AABB with)
+        public readonly AABB Intersection(AABB with)
         {
             Vector3 srcMin = _position;
             Vector3 srcMax = _position + _size;
@@ -447,7 +447,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not they are intersecting.
         /// </returns>
-        public bool Intersects(AABB with, bool includeBorders = false)
+        public readonly bool Intersects(AABB with, bool includeBorders = false)
         {
             if (includeBorders)
             {
@@ -490,7 +490,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="AABB"/> intersects the <see cref="Plane"/>.
         /// </returns>
-        public bool IntersectsPlane(Plane plane)
+        public readonly bool IntersectsPlane(Plane plane)
         {
             Vector3[] points =
             {
@@ -531,7 +531,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="AABB"/> intersects the line segment.
         /// </returns>
-        public bool IntersectsSegment(Vector3 from, Vector3 to)
+        public readonly bool IntersectsSegment(Vector3 from, Vector3 to)
         {
             real_t min = 0f;
             real_t max = 1f;
@@ -590,7 +590,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other <see cref="AABB"/>.</param>
         /// <returns>The merged <see cref="AABB"/>.</returns>
-        public AABB Merge(AABB with)
+        public readonly AABB Merge(AABB with)
         {
             Vector3 beg1 = _position;
             Vector3 beg2 = with._position;
@@ -702,7 +702,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the AABB and the object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is AABB other && Equals(other);
         }
@@ -714,7 +714,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other AABB.</param>
         /// <returns>Whether or not the AABBs are exactly equal.</returns>
-        public bool Equals(AABB other)
+        public readonly bool Equals(AABB other)
         {
             return _position == other._position && _size == other._size;
         }
@@ -725,7 +725,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other AABB to compare.</param>
         /// <returns>Whether or not the AABBs structures are approximately equal.</returns>
-        public bool IsEqualApprox(AABB other)
+        public readonly bool IsEqualApprox(AABB other)
         {
             return _position.IsEqualApprox(other._position) && _size.IsEqualApprox(other._size);
         }
@@ -734,7 +734,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="AABB"/>.
         /// </summary>
         /// <returns>A hash code for this AABB.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return _position.GetHashCode() ^ _size.GetHashCode();
         }
@@ -743,7 +743,7 @@ namespace Godot
         /// Converts this <see cref="AABB"/> to a string.
         /// </summary>
         /// <returns>A string representation of this AABB.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"{_position}, {_size}";
         }
@@ -752,7 +752,7 @@ namespace Godot
         /// Converts this <see cref="AABB"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this AABB.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"{_position.ToString(format)}, {_size.ToString(format)}";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Basis.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Basis.cs
index bb1d6e1661..5d390a298d 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Basis.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Basis.cs
@@ -29,7 +29,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="Column0"/> and array index <c>[0]</c>.</value>
         public Vector3 x
         {
-            get => Column0;
+            readonly get => Column0;
             set => Column0 = value;
         }
 
@@ -39,7 +39,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="Column1"/> and array index <c>[1]</c>.</value>
         public Vector3 y
         {
-            get => Column1;
+            readonly get => Column1;
             set => Column1 = value;
         }
 
@@ -49,7 +49,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="Column2"/> and array index <c>[2]</c>.</value>
         public Vector3 z
         {
-            get => Column2;
+            readonly get => Column2;
             set => Column2 = value;
         }
 
@@ -80,7 +80,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="x"/> and array index <c>[0]</c>.</value>
         public Vector3 Column0
         {
-            get => new Vector3(Row0.x, Row1.x, Row2.x);
+            readonly get => new Vector3(Row0.x, Row1.x, Row2.x);
             set
             {
                 Row0.x = value.x;
@@ -95,7 +95,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="y"/> and array index <c>[1]</c>.</value>
         public Vector3 Column1
         {
-            get => new Vector3(Row0.y, Row1.y, Row2.y);
+            readonly get => new Vector3(Row0.y, Row1.y, Row2.y);
             set
             {
                 Row0.y = value.x;
@@ -110,7 +110,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="z"/> and array index <c>[2]</c>.</value>
         public Vector3 Column2
         {
-            get => new Vector3(Row0.z, Row1.z, Row2.z);
+            readonly get => new Vector3(Row0.z, Row1.z, Row2.z);
             set
             {
                 Row0.z = value.x;
@@ -125,7 +125,7 @@ namespace Godot
         /// <value>Equivalent to the lengths of each column vector, but negative if the determinant is negative.</value>
         public Vector3 Scale
         {
-            get
+            readonly get
             {
                 real_t detSign = Mathf.Sign(Determinant());
                 return detSign * new Vector3
@@ -154,7 +154,7 @@ namespace Godot
         /// <value>The basis column.</value>
         public Vector3 this[int column]
         {
-            get
+            readonly get
             {
                 switch (column)
                 {
@@ -195,7 +195,7 @@ namespace Godot
         /// <value>The matrix element.</value>
         public real_t this[int column, int row]
         {
-            get
+            readonly get
             {
                 return this[column][row];
             }
@@ -234,7 +234,7 @@ namespace Godot
         /// and is usually considered invalid.
         /// </summary>
         /// <returns>The determinant of the basis matrix.</returns>
-        public real_t Determinant()
+        public readonly real_t Determinant()
         {
             real_t cofac00 = Row1[1] * Row2[2] - Row1[2] * Row2[1];
             real_t cofac10 = Row1[2] * Row2[0] - Row1[0] * Row2[2];
@@ -255,7 +255,7 @@ namespace Godot
         /// </summary>
         /// <param name="order">The Euler order to use. By default, use YXZ order (most common).</param>
         /// <returns>A <see cref="Vector3"/> representing the basis rotation in Euler angles.</returns>
-        public Vector3 GetEuler(EulerOrder order = EulerOrder.Yxz)
+        public readonly Vector3 GetEuler(EulerOrder order = EulerOrder.Yxz)
         {
             switch (order)
             {
@@ -499,7 +499,7 @@ namespace Godot
         /// mind that quaternions should generally be preferred to Euler angles.
         /// </summary>
         /// <returns>A <see cref="Quaternion"/> representing the basis's rotation.</returns>
-        internal Quaternion GetQuaternion()
+        internal readonly Quaternion GetQuaternion()
         {
             real_t trace = Row0[0] + Row1[1] + Row2[2];
 
@@ -558,7 +558,7 @@ namespace Godot
         /// be preferred to Euler angles.
         /// </summary>
         /// <returns>The basis rotation.</returns>
-        public Quaternion GetRotationQuaternion()
+        public readonly Quaternion GetRotationQuaternion()
         {
             Basis orthonormalizedBasis = Orthonormalized();
             real_t det = orthonormalizedBasis.Determinant();
@@ -581,7 +581,7 @@ namespace Godot
         /// <paramref name="index"/> is not 0, 1 or 2.
         /// </exception>
         /// <returns>One of <c>Row0</c>, <c>Row1</c>, or <c>Row2</c>.</returns>
-        public Vector3 GetRow(int index)
+        public readonly Vector3 GetRow(int index)
         {
             switch (index)
             {
@@ -633,7 +633,7 @@ namespace Godot
         /// For further details, refer to the Godot source code.
         /// </summary>
         /// <returns>The orthogonal index.</returns>
-        public int GetOrthogonalIndex()
+        public readonly int GetOrthogonalIndex()
         {
             var orth = this;
 
@@ -679,7 +679,7 @@ namespace Godot
         /// Returns the inverse of the matrix.
         /// </summary>
         /// <returns>The inverse matrix.</returns>
-        public Basis Inverse()
+        public readonly Basis Inverse()
         {
             real_t cofac00 = Row1[1] * Row2[2] - Row1[2] * Row2[1];
             real_t cofac10 = Row1[2] * Row2[0] - Row1[0] * Row2[2];
@@ -709,7 +709,7 @@ namespace Godot
             );
         }
 
-        internal Basis Lerp(Basis to, real_t weight)
+        internal readonly Basis Lerp(Basis to, real_t weight)
         {
             Basis b = this;
             b.Row0 = Row0.Lerp(to.Row0, weight);
@@ -724,7 +724,7 @@ namespace Godot
         /// This performs a Gram-Schmidt orthonormalization on the basis of the matrix.
         /// </summary>
         /// <returns>An orthonormalized basis matrix.</returns>
-        public Basis Orthonormalized()
+        public readonly Basis Orthonormalized()
         {
             Vector3 column0 = this[0];
             Vector3 column1 = this[1];
@@ -746,7 +746,7 @@ namespace Godot
         /// <param name="axis">The axis to rotate around. Must be normalized.</param>
         /// <param name="angle">The angle to rotate, in radians.</param>
         /// <returns>The rotated basis matrix.</returns>
-        public Basis Rotated(Vector3 axis, real_t angle)
+        public readonly Basis Rotated(Vector3 axis, real_t angle)
         {
             return new Basis(axis, angle) * this;
         }
@@ -756,7 +756,7 @@ namespace Godot
         /// </summary>
         /// <param name="scale">The scale to introduce.</param>
         /// <returns>The scaled basis matrix.</returns>
-        public Basis Scaled(Vector3 scale)
+        public readonly Basis Scaled(Vector3 scale)
         {
             Basis b = this;
             b.Row0 *= scale.x;
@@ -772,7 +772,7 @@ namespace Godot
         /// <param name="target">The destination basis for interpolation.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting basis matrix of the interpolation.</returns>
-        public Basis Slerp(Basis target, real_t weight)
+        public readonly Basis Slerp(Basis target, real_t weight)
         {
             Quaternion from = new Quaternion(this);
             Quaternion to = new Quaternion(target);
@@ -790,7 +790,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">A vector to calculate the dot product with.</param>
         /// <returns>The resulting dot product.</returns>
-        public real_t Tdotx(Vector3 with)
+        public readonly real_t Tdotx(Vector3 with)
         {
             return Row0[0] * with[0] + Row1[0] * with[1] + Row2[0] * with[2];
         }
@@ -800,7 +800,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">A vector to calculate the dot product with.</param>
         /// <returns>The resulting dot product.</returns>
-        public real_t Tdoty(Vector3 with)
+        public readonly real_t Tdoty(Vector3 with)
         {
             return Row0[1] * with[0] + Row1[1] * with[1] + Row2[1] * with[2];
         }
@@ -810,7 +810,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">A vector to calculate the dot product with.</param>
         /// <returns>The resulting dot product.</returns>
-        public real_t Tdotz(Vector3 with)
+        public readonly real_t Tdotz(Vector3 with)
         {
             return Row0[2] * with[0] + Row1[2] * with[1] + Row2[2] * with[2];
         }
@@ -819,21 +819,18 @@ namespace Godot
         /// Returns the transposed version of the basis matrix.
         /// </summary>
         /// <returns>The transposed basis matrix.</returns>
-        public Basis Transposed()
+        public readonly Basis Transposed()
         {
             Basis tr = this;
 
-            real_t temp = tr.Row0[1];
-            tr.Row0[1] = tr.Row1[0];
-            tr.Row1[0] = temp;
+            tr.Row0[1] = Row1[0];
+            tr.Row1[0] = Row0[1];
 
-            temp = tr.Row0[2];
-            tr.Row0[2] = tr.Row2[0];
-            tr.Row2[0] = temp;
+            tr.Row0[2] = Row2[0];
+            tr.Row2[0] = Row0[2];
 
-            temp = tr.Row1[2];
-            tr.Row1[2] = tr.Row2[1];
-            tr.Row2[1] = temp;
+            tr.Row1[2] = Row2[1];
+            tr.Row2[1] = Row1[2];
 
             return tr;
         }
@@ -1121,7 +1118,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the basis matrix and the object are exactly equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Basis other && Equals(other);
         }
@@ -1133,7 +1130,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other basis.</param>
         /// <returns>Whether or not the basis matrices are exactly equal.</returns>
-        public bool Equals(Basis other)
+        public readonly bool Equals(Basis other)
         {
             return Row0.Equals(other.Row0) && Row1.Equals(other.Row1) && Row2.Equals(other.Row2);
         }
@@ -1144,7 +1141,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other basis to compare.</param>
         /// <returns>Whether or not the bases are approximately equal.</returns>
-        public bool IsEqualApprox(Basis other)
+        public readonly bool IsEqualApprox(Basis other)
         {
             return Row0.IsEqualApprox(other.Row0) && Row1.IsEqualApprox(other.Row1) && Row2.IsEqualApprox(other.Row2);
         }
@@ -1153,7 +1150,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Basis"/>.
         /// </summary>
         /// <returns>A hash code for this basis.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return Row0.GetHashCode() ^ Row1.GetHashCode() ^ Row2.GetHashCode();
         }
@@ -1162,7 +1159,7 @@ namespace Godot
         /// Converts this <see cref="Basis"/> to a string.
         /// </summary>
         /// <returns>A string representation of this basis.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"[X: {x}, Y: {y}, Z: {z}]";
         }
@@ -1171,7 +1168,7 @@ namespace Godot
         /// Converts this <see cref="Basis"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this basis.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"[X: {x.ToString(format)}, Y: {y.ToString(format)}, Z: {z.ToString(format)}]";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/MethodInfo.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/MethodInfo.cs
index 647ae436ff..85d38f9727 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/MethodInfo.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/MethodInfo.cs
@@ -4,7 +4,7 @@ namespace Godot.Bridge;
 
 #nullable enable
 
-public struct MethodInfo
+public readonly struct MethodInfo
 {
     public StringName Name { get; init; }
     public PropertyInfo ReturnVal { get; init; }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/PropertyInfo.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/PropertyInfo.cs
index 80d6f7b4a5..0f447b93c8 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/PropertyInfo.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Bridge/PropertyInfo.cs
@@ -2,7 +2,7 @@ namespace Godot.Bridge;
 
 #nullable enable
 
-public struct PropertyInfo
+public readonly struct PropertyInfo
 {
     public Variant.Type Type { get; init; }
     public StringName Name { get; init; }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Color.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Color.cs
index ee9e59f9fa..f49023555b 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Color.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Color.cs
@@ -43,7 +43,7 @@ namespace Godot
         /// <value>Getting is equivalent to multiplying by 255 and rounding. Setting is equivalent to dividing by 255.</value>
         public int r8
         {
-            get
+            readonly get
             {
                 return (int)Math.Round(r * 255.0f);
             }
@@ -59,7 +59,7 @@ namespace Godot
         /// <value>Getting is equivalent to multiplying by 255 and rounding. Setting is equivalent to dividing by 255.</value>
         public int g8
         {
-            get
+            readonly get
             {
                 return (int)Math.Round(g * 255.0f);
             }
@@ -75,7 +75,7 @@ namespace Godot
         /// <value>Getting is equivalent to multiplying by 255 and rounding. Setting is equivalent to dividing by 255.</value>
         public int b8
         {
-            get
+            readonly get
             {
                 return (int)Math.Round(b * 255.0f);
             }
@@ -91,7 +91,7 @@ namespace Godot
         /// <value>Getting is equivalent to multiplying by 255 and rounding. Setting is equivalent to dividing by 255.</value>
         public int a8
         {
-            get
+            readonly get
             {
                 return (int)Math.Round(a * 255.0f);
             }
@@ -107,7 +107,7 @@ namespace Godot
         /// <value>Getting is a long process, refer to the source code for details. Setting uses <see cref="FromHSV"/>.</value>
         public float h
         {
-            get
+            readonly get
             {
                 float max = Math.Max(r, Math.Max(g, b));
                 float min = Math.Min(r, Math.Min(g, b));
@@ -155,7 +155,7 @@ namespace Godot
         /// <value>Getting is equivalent to the ratio between the min and max RGB value. Setting uses <see cref="FromHSV"/>.</value>
         public float s
         {
-            get
+            readonly get
             {
                 float max = Math.Max(r, Math.Max(g, b));
                 float min = Math.Min(r, Math.Min(g, b));
@@ -176,7 +176,7 @@ namespace Godot
         /// <value>Getting is equivalent to using <see cref="Math.Max(float, float)"/> on the RGB components. Setting uses <see cref="FromHSV"/>.</value>
         public float v
         {
-            get
+            readonly get
             {
                 return Math.Max(r, Math.Max(g, b));
             }
@@ -197,7 +197,7 @@ namespace Godot
         /// </value>
         public float this[int index]
         {
-            get
+            readonly get
             {
                 switch (index)
                 {
@@ -242,7 +242,7 @@ namespace Godot
         /// </summary>
         /// <param name="over">The color to blend over.</param>
         /// <returns>This color blended over <paramref name="over"/>.</returns>
-        public Color Blend(Color over)
+        public readonly Color Blend(Color over)
         {
             Color res;
 
@@ -269,7 +269,7 @@ namespace Godot
         /// <param name="min">The color with minimum allowed values.</param>
         /// <param name="max">The color with maximum allowed values.</param>
         /// <returns>The color with all components clamped.</returns>
-        public Color Clamp(Color? min = null, Color? max = null)
+        public readonly Color Clamp(Color? min = null, Color? max = null)
         {
             Color minimum = min ?? new Color(0, 0, 0, 0);
             Color maximum = max ?? new Color(1, 1, 1, 1);
@@ -288,7 +288,7 @@ namespace Godot
         /// </summary>
         /// <param name="amount">The ratio to darken by.</param>
         /// <returns>The darkened color.</returns>
-        public Color Darkened(float amount)
+        public readonly Color Darkened(float amount)
         {
             Color res = this;
             res.r *= 1.0f - amount;
@@ -301,7 +301,7 @@ namespace Godot
         /// Returns the inverted color: <c>(1 - r, 1 - g, 1 - b, a)</c>.
         /// </summary>
         /// <returns>The inverted color.</returns>
-        public Color Inverted()
+        public readonly Color Inverted()
         {
             return new Color(
                 1.0f - r,
@@ -317,7 +317,7 @@ namespace Godot
         /// </summary>
         /// <param name="amount">The ratio to lighten by.</param>
         /// <returns>The darkened color.</returns>
-        public Color Lightened(float amount)
+        public readonly Color Lightened(float amount)
         {
             Color res = this;
             res.r += (1.0f - res.r) * amount;
@@ -333,7 +333,7 @@ namespace Godot
         /// <param name="to">The destination color for interpolation.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting color of the interpolation.</returns>
-        public Color Lerp(Color to, real_t weight)
+        public readonly Color Lerp(Color to, real_t weight)
         {
             return new Color
             (
@@ -351,7 +351,7 @@ namespace Godot
         /// <param name="to">The destination color for interpolation.</param>
         /// <param name="weight">A color with components on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting color of the interpolation.</returns>
-        public Color Lerp(Color to, Color weight)
+        public readonly Color Lerp(Color to, Color weight)
         {
             return new Color
             (
@@ -368,7 +368,7 @@ namespace Godot
         /// ABGR is the reversed version of the default format.
         /// </summary>
         /// <returns>A <see langword="uint"/> representing this color in ABGR32 format.</returns>
-        public uint ToAbgr32()
+        public readonly uint ToAbgr32()
         {
             uint c = (byte)Math.Round(a * 255);
             c <<= 8;
@@ -387,7 +387,7 @@ namespace Godot
         /// ABGR is the reversed version of the default format.
         /// </summary>
         /// <returns>A <see langword="ulong"/> representing this color in ABGR64 format.</returns>
-        public ulong ToAbgr64()
+        public readonly ulong ToAbgr64()
         {
             ulong c = (ushort)Math.Round(a * 65535);
             c <<= 16;
@@ -406,7 +406,7 @@ namespace Godot
         /// ARGB is more compatible with DirectX, but not used much in Godot.
         /// </summary>
         /// <returns>A <see langword="uint"/> representing this color in ARGB32 format.</returns>
-        public uint ToArgb32()
+        public readonly uint ToArgb32()
         {
             uint c = (byte)Math.Round(a * 255);
             c <<= 8;
@@ -425,7 +425,7 @@ namespace Godot
         /// ARGB is more compatible with DirectX, but not used much in Godot.
         /// </summary>
         /// <returns>A <see langword="ulong"/> representing this color in ARGB64 format.</returns>
-        public ulong ToArgb64()
+        public readonly ulong ToArgb64()
         {
             ulong c = (ushort)Math.Round(a * 65535);
             c <<= 16;
@@ -444,7 +444,7 @@ namespace Godot
         /// RGBA is Godot's default and recommended format.
         /// </summary>
         /// <returns>A <see langword="uint"/> representing this color in RGBA32 format.</returns>
-        public uint ToRgba32()
+        public readonly uint ToRgba32()
         {
             uint c = (byte)Math.Round(r * 255);
             c <<= 8;
@@ -463,7 +463,7 @@ namespace Godot
         /// RGBA is Godot's default and recommended format.
         /// </summary>
         /// <returns>A <see langword="ulong"/> representing this color in RGBA64 format.</returns>
-        public ulong ToRgba64()
+        public readonly ulong ToRgba64()
         {
             ulong c = (ushort)Math.Round(r * 65535);
             c <<= 16;
@@ -483,7 +483,7 @@ namespace Godot
         /// Whether or not to include alpha. If <see langword="false"/>, the color is RGB instead of RGBA.
         /// </param>
         /// <returns>A string for the HTML hexadecimal representation of this color.</returns>
-        public string ToHTML(bool includeAlpha = true)
+        public readonly string ToHTML(bool includeAlpha = true)
         {
             string txt = string.Empty;
 
@@ -777,7 +777,7 @@ namespace Godot
         /// <param name="hue">Output parameter for the HSV hue.</param>
         /// <param name="saturation">Output parameter for the HSV saturation.</param>
         /// <param name="value">Output parameter for the HSV value.</param>
-        public void ToHSV(out float hue, out float saturation, out float value)
+        public readonly void ToHSV(out float hue, out float saturation, out float value)
         {
             float max = (float)Mathf.Max(r, Mathf.Max(g, b));
             float min = (float)Mathf.Min(r, Mathf.Min(g, b));
@@ -1149,7 +1149,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The other object to compare.</param>
         /// <returns>Whether or not the color and the other object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Color other && Equals(other);
         }
@@ -1161,7 +1161,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other color.</param>
         /// <returns>Whether or not the colors are equal.</returns>
-        public bool Equals(Color other)
+        public readonly bool Equals(Color other)
         {
             return r == other.r && g == other.g && b == other.b && a == other.a;
         }
@@ -1172,7 +1172,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other color to compare.</param>
         /// <returns>Whether or not the colors are approximately equal.</returns>
-        public bool IsEqualApprox(Color other)
+        public readonly bool IsEqualApprox(Color other)
         {
             return Mathf.IsEqualApprox(r, other.r) && Mathf.IsEqualApprox(g, other.g) && Mathf.IsEqualApprox(b, other.b) && Mathf.IsEqualApprox(a, other.a);
         }
@@ -1181,7 +1181,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Color"/>.
         /// </summary>
         /// <returns>A hash code for this color.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return r.GetHashCode() ^ g.GetHashCode() ^ b.GetHashCode() ^ a.GetHashCode();
         }
@@ -1190,7 +1190,7 @@ namespace Godot
         /// Converts this <see cref="Color"/> to a string.
         /// </summary>
         /// <returns>A string representation of this color.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"({r}, {g}, {b}, {a})";
         }
@@ -1199,7 +1199,7 @@ namespace Godot
         /// Converts this <see cref="Color"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this color.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"({r.ToString(format)}, {g.ToString(format)}, {b.ToString(format)}, {a.ToString(format)})";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Plane.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Plane.cs
index 664b2e0f34..42c6b0a37e 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Plane.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Plane.cs
@@ -22,7 +22,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="x"/>, <see cref="y"/>, and <see cref="z"/>.</value>
         public Vector3 Normal
         {
-            get { return _normal; }
+            readonly get { return _normal; }
             set { _normal = value; }
         }
 
@@ -32,7 +32,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="Normal"/>'s X value.</value>
         public real_t x
         {
-            get
+            readonly get
             {
                 return _normal.x;
             }
@@ -48,7 +48,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="Normal"/>'s Y value.</value>
         public real_t y
         {
-            get
+            readonly get
             {
                 return _normal.y;
             }
@@ -64,7 +64,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="Normal"/>'s Z value.</value>
         public real_t z
         {
-            get
+            readonly get
             {
                 return _normal.z;
             }
@@ -90,7 +90,7 @@ namespace Godot
         /// <value>Equivalent to <see cref="Normal"/> multiplied by <see cref="D"/>.</value>
         public Vector3 Center
         {
-            get
+            readonly get
             {
                 return _normal * D;
             }
@@ -106,7 +106,7 @@ namespace Godot
         /// </summary>
         /// <param name="point">The position to use for the calculation.</param>
         /// <returns>The shortest distance.</returns>
-        public real_t DistanceTo(Vector3 point)
+        public readonly real_t DistanceTo(Vector3 point)
         {
             return _normal.Dot(point) - D;
         }
@@ -118,7 +118,7 @@ namespace Godot
         /// <param name="point">The point to check.</param>
         /// <param name="tolerance">The tolerance threshold.</param>
         /// <returns>A <see langword="bool"/> for whether or not the plane has the point.</returns>
-        public bool HasPoint(Vector3 point, real_t tolerance = Mathf.Epsilon)
+        public readonly bool HasPoint(Vector3 point, real_t tolerance = Mathf.Epsilon)
         {
             real_t dist = _normal.Dot(point) - D;
             return Mathf.Abs(dist) <= tolerance;
@@ -131,7 +131,7 @@ namespace Godot
         /// <param name="b">One of the three planes to use in the calculation.</param>
         /// <param name="c">One of the three planes to use in the calculation.</param>
         /// <returns>The intersection, or <see langword="null"/> if none is found.</returns>
-        public Vector3? Intersect3(Plane b, Plane c)
+        public readonly Vector3? Intersect3(Plane b, Plane c)
         {
             real_t denom = _normal.Cross(b._normal).Dot(c._normal);
 
@@ -155,7 +155,7 @@ namespace Godot
         /// <param name="from">The start of the ray.</param>
         /// <param name="dir">The direction of the ray, normalized.</param>
         /// <returns>The intersection, or <see langword="null"/> if none is found.</returns>
-        public Vector3? IntersectRay(Vector3 from, Vector3 dir)
+        public readonly Vector3? IntersectRay(Vector3 from, Vector3 dir)
         {
             real_t den = _normal.Dot(dir);
 
@@ -183,7 +183,7 @@ namespace Godot
         /// <param name="begin">The start of the line segment.</param>
         /// <param name="end">The end of the line segment.</param>
         /// <returns>The intersection, or <see langword="null"/> if none is found.</returns>
-        public Vector3? IntersectSegment(Vector3 begin, Vector3 end)
+        public readonly Vector3? IntersectSegment(Vector3 begin, Vector3 end)
         {
             Vector3 segment = begin - end;
             real_t den = _normal.Dot(segment);
@@ -209,7 +209,7 @@ namespace Godot
         /// </summary>
         /// <param name="point">The point to check.</param>
         /// <returns>A <see langword="bool"/> for whether or not the point is above the plane.</returns>
-        public bool IsPointOver(Vector3 point)
+        public readonly bool IsPointOver(Vector3 point)
         {
             return _normal.Dot(point) > D;
         }
@@ -218,7 +218,7 @@ namespace Godot
         /// Returns the plane scaled to unit length.
         /// </summary>
         /// <returns>A normalized version of the plane.</returns>
-        public Plane Normalized()
+        public readonly Plane Normalized()
         {
             real_t len = _normal.Length();
 
@@ -235,7 +235,7 @@ namespace Godot
         /// </summary>
         /// <param name="point">The point to project.</param>
         /// <returns>The projected point.</returns>
-        public Vector3 Project(Vector3 point)
+        public readonly Vector3 Project(Vector3 point)
         {
             return point - (_normal * DistanceTo(point));
         }
@@ -363,7 +363,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The other object to compare.</param>
         /// <returns>Whether or not the plane and the other object are exactly equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Plane other && Equals(other);
         }
@@ -373,7 +373,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other plane to compare.</param>
         /// <returns>Whether or not the planes are exactly equal.</returns>
-        public bool Equals(Plane other)
+        public readonly bool Equals(Plane other)
         {
             return _normal == other._normal && D == other.D;
         }
@@ -384,7 +384,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other plane to compare.</param>
         /// <returns>Whether or not the planes are approximately equal.</returns>
-        public bool IsEqualApprox(Plane other)
+        public readonly bool IsEqualApprox(Plane other)
         {
             return _normal.IsEqualApprox(other._normal) && Mathf.IsEqualApprox(D, other.D);
         }
@@ -393,7 +393,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Plane"/>.
         /// </summary>
         /// <returns>A hash code for this plane.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return _normal.GetHashCode() ^ D.GetHashCode();
         }
@@ -402,7 +402,7 @@ namespace Godot
         /// Converts this <see cref="Plane"/> to a string.
         /// </summary>
         /// <returns>A string representation of this plane.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"{_normal}, {D}";
         }
@@ -411,7 +411,7 @@ namespace Godot
         /// Converts this <see cref="Plane"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this plane.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"{_normal.ToString(format)}, {D.ToString(format)}";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Projection.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Projection.cs
index da895fd121..371729ebec 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Projection.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Projection.cs
@@ -286,7 +286,7 @@ namespace Godot
             return proj * cm;
         }
 
-        public real_t Determinant()
+        public readonly real_t Determinant()
         {
             return x.w * y.z * z.y * w.x - x.z * y.w * z.y * w.x -
                    x.w * y.y * z.z * w.x + x.y * y.w * z.z * w.x +
@@ -302,13 +302,13 @@ namespace Godot
                    x.y * y.x * z.z * w.w + x.x * y.y * z.z * w.w;
         }
 
-        public real_t GetAspect()
+        public readonly real_t GetAspect()
         {
             Vector2 vpHe = GetViewportHalfExtents();
             return vpHe.x / vpHe.y;
         }
 
-        public real_t GetFov()
+        public readonly real_t GetFov()
         {
             Plane rightPlane = new Plane(x.w - x.x, y.w - y.x, z.w - z.x, -w.w + w.x).Normalized();
             if (z.x == 0 && z.y == 0)
@@ -327,7 +327,7 @@ namespace Godot
             return Mathf.RadToDeg(Mathf.Atan(aspect * Mathf.Tan(Mathf.DegToRad(fovx) * (real_t)0.5)) * (real_t)2.0);
         }
 
-        public real_t GetLodMultiplier()
+        public readonly real_t GetLodMultiplier()
         {
             if (IsOrthogonal())
             {
@@ -341,14 +341,14 @@ namespace Godot
             }
         }
 
-        public int GetPixelsPerMeter(int forPixelWidth)
+        public readonly int GetPixelsPerMeter(int forPixelWidth)
         {
             Vector3 result = this * new Vector3(1, 0, -1);
 
             return (int)((result.x * (real_t)0.5 + (real_t)0.5) * forPixelWidth);
         }
 
-        public Plane GetProjectionPlane(Planes plane)
+        public readonly Plane GetProjectionPlane(Planes plane)
         {
             Plane newPlane = plane switch
             {
@@ -364,36 +364,36 @@ namespace Godot
             return newPlane.Normalized();
         }
 
-        public Vector2 GetFarPlaneHalfExtents()
+        public readonly Vector2 GetFarPlaneHalfExtents()
         {
             var res = GetProjectionPlane(Planes.Far).Intersect3(GetProjectionPlane(Planes.Right), GetProjectionPlane(Planes.Top));
             return new Vector2(res.Value.x, res.Value.y);
         }
 
-        public Vector2 GetViewportHalfExtents()
+        public readonly Vector2 GetViewportHalfExtents()
         {
             var res = GetProjectionPlane(Planes.Near).Intersect3(GetProjectionPlane(Planes.Right), GetProjectionPlane(Planes.Top));
             return new Vector2(res.Value.x, res.Value.y);
         }
 
-        public real_t GetZFar()
+        public readonly real_t GetZFar()
         {
             return GetProjectionPlane(Planes.Far).D;
         }
 
-        public real_t GetZNear()
+        public readonly real_t GetZNear()
         {
             return -GetProjectionPlane(Planes.Near).D;
         }
 
-        public Projection FlippedY()
+        public readonly Projection FlippedY()
         {
             Projection proj = this;
             proj.y = -proj.y;
             return proj;
         }
 
-        public Projection PerspectiveZNearAdjusted(real_t newZNear)
+        public readonly Projection PerspectiveZNearAdjusted(real_t newZNear)
         {
             Projection proj = this;
             real_t zFar = GetZFar();
@@ -404,7 +404,7 @@ namespace Godot
             return proj;
         }
 
-        public Projection JitterOffseted(Vector2 offset)
+        public readonly Projection JitterOffseted(Vector2 offset)
         {
             Projection proj = this;
             proj.w.x += offset.x;
@@ -412,7 +412,7 @@ namespace Godot
             return proj;
         }
 
-        public Projection Inverse()
+        public readonly Projection Inverse()
         {
             Projection proj = this;
             int i, j, k;
@@ -535,7 +535,7 @@ namespace Godot
             return proj;
         }
 
-        public bool IsOrthogonal()
+        public readonly bool IsOrthogonal()
         {
             return w.w == (real_t)1.0;
         }
@@ -654,7 +654,7 @@ namespace Godot
         /// </exception>
         public Vector4 this[int column]
         {
-            get
+            readonly get
             {
                 switch (column)
                 {
@@ -702,7 +702,7 @@ namespace Godot
         /// </exception>
         public real_t this[int column, int row]
         {
-            get
+            readonly get
             {
                 switch (column)
                 {
@@ -772,7 +772,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Projection"/>.
         /// </summary>
         /// <returns>A hash code for this projection.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return y.GetHashCode() ^ x.GetHashCode() ^ z.GetHashCode() ^ w.GetHashCode();
         }
@@ -781,7 +781,7 @@ namespace Godot
         /// Converts this <see cref="Projection"/> to a string.
         /// </summary>
         /// <returns>A string representation of this projection.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"{x.x}, {x.y}, {x.z}, {x.w}\n{y.x}, {y.y}, {y.z}, {y.w}\n{z.x}, {z.y}, {z.z}, {z.w}\n{w.x}, {w.y}, {w.z}, {w.w}\n";
         }
@@ -790,7 +790,7 @@ namespace Godot
         /// Converts this <see cref="Projection"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this projection.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"{x.x.ToString(format)}, {x.y.ToString(format)}, {x.z.ToString(format)}, {x.w.ToString(format)}\n" +
                 $"{y.x.ToString(format)}, {y.y.ToString(format)}, {y.z.ToString(format)}, {y.w.ToString(format)}\n" +
@@ -804,7 +804,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the vector and the object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Projection other && Equals(other);
         }
@@ -814,7 +814,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other projection.</param>
         /// <returns>Whether or not the projections are exactly equal.</returns>
-        public bool Equals(Projection other)
+        public readonly bool Equals(Projection other)
         {
             return x == other.x && y == other.y && z == other.z && w == other.w;
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Quaternion.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Quaternion.cs
index f01f0be985..c55003586b 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Quaternion.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Quaternion.cs
@@ -58,7 +58,7 @@ namespace Godot
         /// </value>
         public real_t this[int index]
         {
-            get
+            readonly get
             {
                 switch (index)
                 {
@@ -101,7 +101,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="LengthSquared"/>
         /// <value>Equivalent to <c>Mathf.Sqrt(LengthSquared)</c>.</value>
-        public real_t Length
+        public readonly real_t Length
         {
             get { return Mathf.Sqrt(LengthSquared); }
         }
@@ -112,7 +112,7 @@ namespace Godot
         /// you need to compare quaternions or need the squared length for some formula.
         /// </summary>
         /// <value>Equivalent to <c>Dot(this)</c>.</value>
-        public real_t LengthSquared
+        public readonly real_t LengthSquared
         {
             get { return Dot(this); }
         }
@@ -128,7 +128,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other quaternion.</param>
         /// <returns>The angle between the quaternions.</returns>
-        public real_t AngleTo(Quaternion to)
+        public readonly real_t AngleTo(Quaternion to)
         {
             real_t dot = Dot(to);
             return Mathf.Acos(Mathf.Clamp(dot * dot * 2 - 1, -1, 1));
@@ -143,7 +143,7 @@ namespace Godot
         /// <param name="postB">A quaternion after <paramref name="b"/>.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated quaternion.</returns>
-        public Quaternion SphericalCubicInterpolate(Quaternion b, Quaternion preA, Quaternion postB, real_t weight)
+        public readonly Quaternion SphericalCubicInterpolate(Quaternion b, Quaternion preA, Quaternion postB, real_t weight)
         {
 #if DEBUG
             if (!IsNormalized())
@@ -212,7 +212,7 @@ namespace Godot
         /// <param name="preAT"></param>
         /// <param name="postBT"></param>
         /// <returns>The interpolated quaternion.</returns>
-        public Quaternion SphericalCubicInterpolateInTime(Quaternion b, Quaternion preA, Quaternion postB, real_t weight, real_t bT, real_t preAT, real_t postBT)
+        public readonly Quaternion SphericalCubicInterpolateInTime(Quaternion b, Quaternion preA, Quaternion postB, real_t weight, real_t bT, real_t preAT, real_t postBT)
         {
 #if DEBUG
             if (!IsNormalized())
@@ -272,12 +272,12 @@ namespace Godot
         /// </summary>
         /// <param name="b">The other quaternion.</param>
         /// <returns>The dot product.</returns>
-        public real_t Dot(Quaternion b)
+        public readonly real_t Dot(Quaternion b)
         {
             return (x * b.x) + (y * b.y) + (z * b.z) + (w * b.w);
         }
 
-        public Quaternion Exp()
+        public readonly Quaternion Exp()
         {
             Vector3 v = new Vector3(x, y, z);
             real_t theta = v.Length();
@@ -289,12 +289,12 @@ namespace Godot
             return new Quaternion(v, theta);
         }
 
-        public real_t GetAngle()
+        public readonly real_t GetAngle()
         {
             return 2 * Mathf.Acos(w);
         }
 
-        public Vector3 GetAxis()
+        public readonly Vector3 GetAxis()
         {
             if (Mathf.Abs(w) > 1 - Mathf.Epsilon)
             {
@@ -312,7 +312,7 @@ namespace Godot
         /// the rotation angles in the format (X angle, Y angle, Z angle).
         /// </summary>
         /// <returns>The Euler angle representation of this quaternion.</returns>
-        public Vector3 GetEuler(EulerOrder order = EulerOrder.Yxz)
+        public readonly Vector3 GetEuler(EulerOrder order = EulerOrder.Yxz)
         {
 #if DEBUG
             if (!IsNormalized())
@@ -328,7 +328,7 @@ namespace Godot
         /// Returns the inverse of the quaternion.
         /// </summary>
         /// <returns>The inverse quaternion.</returns>
-        public Quaternion Inverse()
+        public readonly Quaternion Inverse()
         {
 #if DEBUG
             if (!IsNormalized())
@@ -343,12 +343,12 @@ namespace Godot
         /// Returns whether the quaternion is normalized or not.
         /// </summary>
         /// <returns>A <see langword="bool"/> for whether the quaternion is normalized or not.</returns>
-        public bool IsNormalized()
+        public readonly bool IsNormalized()
         {
             return Mathf.Abs(LengthSquared - 1) <= Mathf.Epsilon;
         }
 
-        public Quaternion Log()
+        public readonly Quaternion Log()
         {
             Vector3 v = GetAxis() * GetAngle();
             return new Quaternion(v.x, v.y, v.z, 0);
@@ -358,7 +358,7 @@ namespace Godot
         /// Returns a copy of the quaternion, normalized to unit length.
         /// </summary>
         /// <returns>The normalized quaternion.</returns>
-        public Quaternion Normalized()
+        public readonly Quaternion Normalized()
         {
             return this / Length;
         }
@@ -372,7 +372,7 @@ namespace Godot
         /// <param name="to">The destination quaternion for interpolation. Must be normalized.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting quaternion of the interpolation.</returns>
-        public Quaternion Slerp(Quaternion to, real_t weight)
+        public readonly Quaternion Slerp(Quaternion to, real_t weight)
         {
 #if DEBUG
             if (!IsNormalized())
@@ -437,7 +437,7 @@ namespace Godot
         /// <param name="to">The destination quaternion for interpolation. Must be normalized.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting quaternion of the interpolation.</returns>
-        public Quaternion Slerpni(Quaternion to, real_t weight)
+        public readonly Quaternion Slerpni(Quaternion to, real_t weight)
         {
 #if DEBUG
             if (!IsNormalized())
@@ -762,7 +762,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The other object to compare.</param>
         /// <returns>Whether or not the quaternion and the other object are exactly equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Quaternion other && Equals(other);
         }
@@ -772,7 +772,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other quaternion to compare.</param>
         /// <returns>Whether or not the quaternions are exactly equal.</returns>
-        public bool Equals(Quaternion other)
+        public readonly bool Equals(Quaternion other)
         {
             return x == other.x && y == other.y && z == other.z && w == other.w;
         }
@@ -783,7 +783,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other quaternion to compare.</param>
         /// <returns>Whether or not the quaternions are approximately equal.</returns>
-        public bool IsEqualApprox(Quaternion other)
+        public readonly bool IsEqualApprox(Quaternion other)
         {
             return Mathf.IsEqualApprox(x, other.x) && Mathf.IsEqualApprox(y, other.y) && Mathf.IsEqualApprox(z, other.z) && Mathf.IsEqualApprox(w, other.w);
         }
@@ -792,7 +792,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Quaternion"/>.
         /// </summary>
         /// <returns>A hash code for this quaternion.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return y.GetHashCode() ^ x.GetHashCode() ^ z.GetHashCode() ^ w.GetHashCode();
         }
@@ -801,7 +801,7 @@ namespace Godot
         /// Converts this <see cref="Quaternion"/> to a string.
         /// </summary>
         /// <returns>A string representation of this quaternion.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"({x}, {y}, {z}, {w})";
         }
@@ -810,7 +810,7 @@ namespace Godot
         /// Converts this <see cref="Quaternion"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this quaternion.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"({x.ToString(format)}, {y.ToString(format)}, {z.ToString(format)}, {w.ToString(format)})";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/RID.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/RID.cs
index a31fef8360..59b9faf16c 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/RID.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/RID.cs
@@ -12,9 +12,9 @@ namespace Godot
     /// classes such as <see cref="RenderingServer"/>.
     /// </summary>
     [StructLayout(LayoutKind.Sequential)]
-    public struct RID
+    public readonly struct RID
     {
-        private ulong _id; // Default is 0
+        private readonly ulong _id; // Default is 0
 
         internal RID(ulong id)
         {
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Rect2.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Rect2.cs
index e80d75dacf..b0e0e75a34 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Rect2.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Rect2.cs
@@ -20,7 +20,7 @@ namespace Godot
         /// <value>Directly uses a private field.</value>
         public Vector2 Position
         {
-            get { return _position; }
+            readonly get { return _position; }
             set { _position = value; }
         }
 
@@ -31,7 +31,7 @@ namespace Godot
         /// <value>Directly uses a private field.</value>
         public Vector2 Size
         {
-            get { return _size; }
+            readonly get { return _size; }
             set { _size = value; }
         }
 
@@ -45,7 +45,7 @@ namespace Godot
         /// </value>
         public Vector2 End
         {
-            get { return _position + _size; }
+            readonly get { return _position + _size; }
             set { _size = value - _position; }
         }
 
@@ -53,7 +53,7 @@ namespace Godot
         /// The area of this <see cref="Rect2"/>.
         /// </summary>
         /// <value>Equivalent to <see cref="GetArea()"/>.</value>
-        public real_t Area
+        public readonly real_t Area
         {
             get { return GetArea(); }
         }
@@ -63,7 +63,7 @@ namespace Godot
         /// the top-left corner is the origin and width and height are positive.
         /// </summary>
         /// <returns>The modified <see cref="Rect2"/>.</returns>
-        public Rect2 Abs()
+        public readonly Rect2 Abs()
         {
             Vector2 end = End;
             Vector2 topLeft = new Vector2(Mathf.Min(_position.x, end.x), Mathf.Min(_position.y, end.y));
@@ -79,7 +79,7 @@ namespace Godot
         /// The intersection of this <see cref="Rect2"/> and <paramref name="b"/>,
         /// or an empty <see cref="Rect2"/> if they do not intersect.
         /// </returns>
-        public Rect2 Intersection(Rect2 b)
+        public readonly Rect2 Intersection(Rect2 b)
         {
             Rect2 newRect = b;
 
@@ -107,7 +107,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not this <see cref="Rect2"/> encloses <paramref name="b"/>.
         /// </returns>
-        public bool Encloses(Rect2 b)
+        public readonly bool Encloses(Rect2 b)
         {
             return b._position.x >= _position.x && b._position.y >= _position.y &&
                b._position.x + b._size.x < _position.x + _size.x &&
@@ -119,7 +119,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The point to include.</param>
         /// <returns>The expanded <see cref="Rect2"/>.</returns>
-        public Rect2 Expand(Vector2 to)
+        public readonly Rect2 Expand(Vector2 to)
         {
             Rect2 expanded = this;
 
@@ -154,7 +154,7 @@ namespace Godot
         /// Returns the area of the <see cref="Rect2"/>.
         /// </summary>
         /// <returns>The area.</returns>
-        public real_t GetArea()
+        public readonly real_t GetArea()
         {
             return _size.x * _size.y;
         }
@@ -164,7 +164,7 @@ namespace Godot
         /// to <see cref="Position"/> + (<see cref="Size"/> / 2).
         /// </summary>
         /// <returns>The center.</returns>
-        public Vector2 GetCenter()
+        public readonly Vector2 GetCenter()
         {
             return _position + (_size * 0.5f);
         }
@@ -177,7 +177,7 @@ namespace Godot
         /// <seealso cref="GrowSide(Side, real_t)"/>
         /// <param name="by">The amount to grow by.</param>
         /// <returns>The grown <see cref="Rect2"/>.</returns>
-        public Rect2 Grow(real_t by)
+        public readonly Rect2 Grow(real_t by)
         {
             Rect2 g = this;
 
@@ -200,7 +200,7 @@ namespace Godot
         /// <param name="right">The amount to grow by on the right side.</param>
         /// <param name="bottom">The amount to grow by on the bottom side.</param>
         /// <returns>The grown <see cref="Rect2"/>.</returns>
-        public Rect2 GrowIndividual(real_t left, real_t top, real_t right, real_t bottom)
+        public readonly Rect2 GrowIndividual(real_t left, real_t top, real_t right, real_t bottom)
         {
             Rect2 g = this;
 
@@ -221,7 +221,7 @@ namespace Godot
         /// <param name="side">The side to grow.</param>
         /// <param name="by">The amount to grow by.</param>
         /// <returns>The grown <see cref="Rect2"/>.</returns>
-        public Rect2 GrowSide(Side side, real_t by)
+        public readonly Rect2 GrowSide(Side side, real_t by)
         {
             Rect2 g = this;
 
@@ -242,7 +242,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="Rect2"/> has area.
         /// </returns>
-        public bool HasArea()
+        public readonly bool HasArea()
         {
             return _size.x > 0.0f && _size.y > 0.0f;
         }
@@ -255,7 +255,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="Rect2"/> contains <paramref name="point"/>.
         /// </returns>
-        public bool HasPoint(Vector2 point)
+        public readonly bool HasPoint(Vector2 point)
         {
             if (point.x < _position.x)
                 return false;
@@ -281,7 +281,7 @@ namespace Godot
         /// <param name="b">The other <see cref="Rect2"/> to check for intersections with.</param>
         /// <param name="includeBorders">Whether or not to consider borders.</param>
         /// <returns>A <see langword="bool"/> for whether or not they are intersecting.</returns>
-        public bool Intersects(Rect2 b, bool includeBorders = false)
+        public readonly bool Intersects(Rect2 b, bool includeBorders = false)
         {
             if (includeBorders)
             {
@@ -330,7 +330,7 @@ namespace Godot
         /// </summary>
         /// <param name="b">The other <see cref="Rect2"/>.</param>
         /// <returns>The merged <see cref="Rect2"/>.</returns>
-        public Rect2 Merge(Rect2 b)
+        public readonly Rect2 Merge(Rect2 b)
         {
             Rect2 newRect;
 
@@ -426,7 +426,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The other object to compare.</param>
         /// <returns>Whether or not the rect and the other object are exactly equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Rect2 other && Equals(other);
         }
@@ -436,7 +436,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other rect to compare.</param>
         /// <returns>Whether or not the rects are exactly equal.</returns>
-        public bool Equals(Rect2 other)
+        public readonly bool Equals(Rect2 other)
         {
             return _position.Equals(other._position) && _size.Equals(other._size);
         }
@@ -447,7 +447,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other rect to compare.</param>
         /// <returns>Whether or not the rects are approximately equal.</returns>
-        public bool IsEqualApprox(Rect2 other)
+        public readonly bool IsEqualApprox(Rect2 other)
         {
             return _position.IsEqualApprox(other._position) && _size.IsEqualApprox(other.Size);
         }
@@ -456,7 +456,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Rect2"/>.
         /// </summary>
         /// <returns>A hash code for this rect.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return _position.GetHashCode() ^ _size.GetHashCode();
         }
@@ -465,7 +465,7 @@ namespace Godot
         /// Converts this <see cref="Rect2"/> to a string.
         /// </summary>
         /// <returns>A string representation of this rect.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"{_position}, {_size}";
         }
@@ -474,7 +474,7 @@ namespace Godot
         /// Converts this <see cref="Rect2"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this rect.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"{_position.ToString(format)}, {_size.ToString(format)}";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Rect2i.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Rect2i.cs
index b2768476cc..faee81a98a 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Rect2i.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Rect2i.cs
@@ -20,7 +20,7 @@ namespace Godot
         /// <value>Directly uses a private field.</value>
         public Vector2i Position
         {
-            get { return _position; }
+            readonly get { return _position; }
             set { _position = value; }
         }
 
@@ -31,7 +31,7 @@ namespace Godot
         /// <value>Directly uses a private field.</value>
         public Vector2i Size
         {
-            get { return _size; }
+            readonly get { return _size; }
             set { _size = value; }
         }
 
@@ -45,7 +45,7 @@ namespace Godot
         /// </value>
         public Vector2i End
         {
-            get { return _position + _size; }
+            readonly get { return _position + _size; }
             set { _size = value - _position; }
         }
 
@@ -53,7 +53,7 @@ namespace Godot
         /// The area of this <see cref="Rect2i"/>.
         /// </summary>
         /// <value>Equivalent to <see cref="GetArea()"/>.</value>
-        public int Area
+        public readonly int Area
         {
             get { return GetArea(); }
         }
@@ -63,7 +63,7 @@ namespace Godot
         /// the top-left corner is the origin and width and height are positive.
         /// </summary>
         /// <returns>The modified <see cref="Rect2i"/>.</returns>
-        public Rect2i Abs()
+        public readonly Rect2i Abs()
         {
             Vector2i end = End;
             Vector2i topLeft = new Vector2i(Mathf.Min(_position.x, end.x), Mathf.Min(_position.y, end.y));
@@ -79,7 +79,7 @@ namespace Godot
         /// The intersection of this <see cref="Rect2i"/> and <paramref name="b"/>,
         /// or an empty <see cref="Rect2i"/> if they do not intersect.
         /// </returns>
-        public Rect2i Intersection(Rect2i b)
+        public readonly Rect2i Intersection(Rect2i b)
         {
             Rect2i newRect = b;
 
@@ -107,7 +107,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not this <see cref="Rect2i"/> encloses <paramref name="b"/>.
         /// </returns>
-        public bool Encloses(Rect2i b)
+        public readonly bool Encloses(Rect2i b)
         {
             return b._position.x >= _position.x && b._position.y >= _position.y &&
                b._position.x + b._size.x < _position.x + _size.x &&
@@ -119,7 +119,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The point to include.</param>
         /// <returns>The expanded <see cref="Rect2i"/>.</returns>
-        public Rect2i Expand(Vector2i to)
+        public readonly Rect2i Expand(Vector2i to)
         {
             Rect2i expanded = this;
 
@@ -154,7 +154,7 @@ namespace Godot
         /// Returns the area of the <see cref="Rect2i"/>.
         /// </summary>
         /// <returns>The area.</returns>
-        public int GetArea()
+        public readonly int GetArea()
         {
             return _size.x * _size.y;
         }
@@ -166,7 +166,7 @@ namespace Godot
         /// value will be rounded towards <see cref="Position"/>.
         /// </summary>
         /// <returns>The center.</returns>
-        public Vector2i GetCenter()
+        public readonly Vector2i GetCenter()
         {
             return _position + (_size / 2);
         }
@@ -179,7 +179,7 @@ namespace Godot
         /// <seealso cref="GrowSide(Side, int)"/>
         /// <param name="by">The amount to grow by.</param>
         /// <returns>The grown <see cref="Rect2i"/>.</returns>
-        public Rect2i Grow(int by)
+        public readonly Rect2i Grow(int by)
         {
             Rect2i g = this;
 
@@ -202,7 +202,7 @@ namespace Godot
         /// <param name="right">The amount to grow by on the right side.</param>
         /// <param name="bottom">The amount to grow by on the bottom side.</param>
         /// <returns>The grown <see cref="Rect2i"/>.</returns>
-        public Rect2i GrowIndividual(int left, int top, int right, int bottom)
+        public readonly Rect2i GrowIndividual(int left, int top, int right, int bottom)
         {
             Rect2i g = this;
 
@@ -223,7 +223,7 @@ namespace Godot
         /// <param name="side">The side to grow.</param>
         /// <param name="by">The amount to grow by.</param>
         /// <returns>The grown <see cref="Rect2i"/>.</returns>
-        public Rect2i GrowSide(Side side, int by)
+        public readonly Rect2i GrowSide(Side side, int by)
         {
             Rect2i g = this;
 
@@ -244,7 +244,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="Rect2i"/> has area.
         /// </returns>
-        public bool HasArea()
+        public readonly bool HasArea()
         {
             return _size.x > 0 && _size.y > 0;
         }
@@ -257,7 +257,7 @@ namespace Godot
         /// <returns>
         /// A <see langword="bool"/> for whether or not the <see cref="Rect2i"/> contains <paramref name="point"/>.
         /// </returns>
-        public bool HasPoint(Vector2i point)
+        public readonly bool HasPoint(Vector2i point)
         {
             if (point.x < _position.x)
                 return false;
@@ -283,7 +283,7 @@ namespace Godot
         /// <param name="b">The other <see cref="Rect2i"/> to check for intersections with.</param>
         /// <param name="includeBorders">Whether or not to consider borders.</param>
         /// <returns>A <see langword="bool"/> for whether or not they are intersecting.</returns>
-        public bool Intersects(Rect2i b, bool includeBorders = false)
+        public readonly bool Intersects(Rect2i b, bool includeBorders = false)
         {
             if (includeBorders)
             {
@@ -316,7 +316,7 @@ namespace Godot
         /// </summary>
         /// <param name="b">The other <see cref="Rect2i"/>.</param>
         /// <returns>The merged <see cref="Rect2i"/>.</returns>
-        public Rect2i Merge(Rect2i b)
+        public readonly Rect2i Merge(Rect2i b)
         {
             Rect2i newRect;
 
@@ -426,7 +426,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The other object to compare.</param>
         /// <returns>Whether or not the rect and the other object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Rect2i other && Equals(other);
         }
@@ -436,7 +436,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other rect to compare.</param>
         /// <returns>Whether or not the rects are equal.</returns>
-        public bool Equals(Rect2i other)
+        public readonly bool Equals(Rect2i other)
         {
             return _position.Equals(other._position) && _size.Equals(other._size);
         }
@@ -445,7 +445,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Rect2i"/>.
         /// </summary>
         /// <returns>A hash code for this rect.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return _position.GetHashCode() ^ _size.GetHashCode();
         }
@@ -454,7 +454,7 @@ namespace Godot
         /// Converts this <see cref="Rect2i"/> to a string.
         /// </summary>
         /// <returns>A string representation of this rect.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"{_position}, {_size}";
         }
@@ -463,7 +463,7 @@ namespace Godot
         /// Converts this <see cref="Rect2i"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this rect.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"{_position.ToString(format)}, {_size.ToString(format)}";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform2D.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform2D.cs
index 894667db76..756f71e5b2 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform2D.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform2D.cs
@@ -37,7 +37,7 @@ namespace Godot
         /// <value>Getting is equivalent to calling <see cref="Mathf.Atan2(real_t, real_t)"/> with the values of <see cref="x"/>.</value>
         public real_t Rotation
         {
-            get
+            readonly get
             {
                 return Mathf.Atan2(x.y, x.x);
             }
@@ -57,7 +57,7 @@ namespace Godot
         /// <value>Equivalent to the lengths of each column vector, but Y is negative if the determinant is negative.</value>
         public Vector2 Scale
         {
-            get
+            readonly get
             {
                 real_t detSign = Mathf.Sign(BasisDeterminant());
                 return new Vector2(x.Length(), detSign * y.Length());
@@ -80,7 +80,7 @@ namespace Godot
         /// </exception>
         public Vector2 this[int column]
         {
-            get
+            readonly get
             {
                 switch (column)
                 {
@@ -121,7 +121,7 @@ namespace Godot
         /// <param name="row">Which row, the matrix vertical position.</param>
         public real_t this[int column, int row]
         {
-            get
+            readonly get
             {
                 return this[column][row];
             }
@@ -139,7 +139,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="Inverse"/>
         /// <returns>The inverse transformation matrix.</returns>
-        public Transform2D AffineInverse()
+        public readonly Transform2D AffineInverse()
         {
             real_t det = BasisDeterminant();
 
@@ -148,9 +148,8 @@ namespace Godot
 
             Transform2D inv = this;
 
-            real_t temp = inv[0, 0];
-            inv[0, 0] = inv[1, 1];
-            inv[1, 1] = temp;
+            inv[0, 0] = this[1, 1];
+            inv[1, 1] = this[0, 0];
 
             real_t detInv = 1.0f / det;
 
@@ -171,7 +170,7 @@ namespace Godot
         /// and is usually considered invalid.
         /// </summary>
         /// <returns>The determinant of the basis matrix.</returns>
-        private real_t BasisDeterminant()
+        private readonly real_t BasisDeterminant()
         {
             return (x.x * y.y) - (x.y * y.x);
         }
@@ -183,7 +182,7 @@ namespace Godot
         /// <seealso cref="BasisXformInv(Vector2)"/>
         /// <param name="v">A vector to transform.</param>
         /// <returns>The transformed vector.</returns>
-        public Vector2 BasisXform(Vector2 v)
+        public readonly Vector2 BasisXform(Vector2 v)
         {
             return new Vector2(Tdotx(v), Tdoty(v));
         }
@@ -198,7 +197,7 @@ namespace Godot
         /// <seealso cref="BasisXform(Vector2)"/>
         /// <param name="v">A vector to inversely transform.</param>
         /// <returns>The inversely transformed vector.</returns>
-        public Vector2 BasisXformInv(Vector2 v)
+        public readonly Vector2 BasisXformInv(Vector2 v)
         {
             return new Vector2(x.Dot(v), y.Dot(v));
         }
@@ -209,7 +208,7 @@ namespace Godot
         /// <param name="transform">The other transform.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated transform.</returns>
-        public Transform2D InterpolateWith(Transform2D transform, real_t weight)
+        public readonly Transform2D InterpolateWith(Transform2D transform, real_t weight)
         {
             real_t r1 = Rotation;
             real_t r2 = transform.Rotation;
@@ -258,14 +257,13 @@ namespace Godot
         /// (no scaling, use <see cref="AffineInverse"/> for transforms with scaling).
         /// </summary>
         /// <returns>The inverse matrix.</returns>
-        public Transform2D Inverse()
+        public readonly Transform2D Inverse()
         {
             Transform2D inv = this;
 
             // Swap
-            real_t temp = inv.x.y;
-            inv.x.y = inv.y.x;
-            inv.y.x = temp;
+            inv.x.y = y.x;
+            inv.y.x = x.y;
 
             inv.origin = inv.BasisXform(-inv.origin);
 
@@ -277,7 +275,7 @@ namespace Godot
         /// and normalized axis vectors (scale of 1 or -1).
         /// </summary>
         /// <returns>The orthonormalized transform.</returns>
-        public Transform2D Orthonormalized()
+        public readonly Transform2D Orthonormalized()
         {
             Transform2D on = this;
 
@@ -301,7 +299,7 @@ namespace Godot
         /// </summary>
         /// <param name="angle">The angle to rotate, in radians.</param>
         /// <returns>The rotated transformation matrix.</returns>
-        public Transform2D Rotated(real_t angle)
+        public readonly Transform2D Rotated(real_t angle)
         {
             return this * new Transform2D(angle, new Vector2());
         }
@@ -313,7 +311,7 @@ namespace Godot
         /// </summary>
         /// <param name="angle">The angle to rotate, in radians.</param>
         /// <returns>The rotated transformation matrix.</returns>
-        public Transform2D RotatedLocal(real_t angle)
+        public readonly Transform2D RotatedLocal(real_t angle)
         {
             return new Transform2D(angle, new Vector2()) * this;
         }
@@ -325,7 +323,7 @@ namespace Godot
         /// </summary>
         /// <param name="scale">The scale to introduce.</param>
         /// <returns>The scaled transformation matrix.</returns>
-        public Transform2D Scaled(Vector2 scale)
+        public readonly Transform2D Scaled(Vector2 scale)
         {
             Transform2D copy = this;
             copy.x *= scale;
@@ -341,7 +339,7 @@ namespace Godot
         /// </summary>
         /// <param name="scale">The scale to introduce.</param>
         /// <returns>The scaled transformation matrix.</returns>
-        public Transform2D ScaledLocal(Vector2 scale)
+        public readonly Transform2D ScaledLocal(Vector2 scale)
         {
             Transform2D copy = this;
             copy.x *= scale;
@@ -349,12 +347,12 @@ namespace Godot
             return copy;
         }
 
-        private real_t Tdotx(Vector2 with)
+        private readonly real_t Tdotx(Vector2 with)
         {
             return (this[0, 0] * with[0]) + (this[1, 0] * with[1]);
         }
 
-        private real_t Tdoty(Vector2 with)
+        private readonly real_t Tdoty(Vector2 with)
         {
             return (this[0, 1] * with[0]) + (this[1, 1] * with[1]);
         }
@@ -366,7 +364,7 @@ namespace Godot
         /// </summary>
         /// <param name="offset">The offset to translate by.</param>
         /// <returns>The translated matrix.</returns>
-        public Transform2D Translated(Vector2 offset)
+        public readonly Transform2D Translated(Vector2 offset)
         {
             Transform2D copy = this;
             copy.origin += offset;
@@ -380,7 +378,7 @@ namespace Godot
         /// </summary>
         /// <param name="offset">The offset to translate by.</param>
         /// <returns>The translated matrix.</returns>
-        public Transform2D TranslatedLocal(Vector2 offset)
+        public readonly Transform2D TranslatedLocal(Vector2 offset)
         {
             Transform2D copy = this;
             copy.origin += copy.BasisXform(offset);
@@ -603,7 +601,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the transform and the object are exactly equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Transform2D other && Equals(other);
         }
@@ -615,7 +613,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other transform to compare.</param>
         /// <returns>Whether or not the matrices are exactly equal.</returns>
-        public bool Equals(Transform2D other)
+        public readonly bool Equals(Transform2D other)
         {
             return x.Equals(other.x) && y.Equals(other.y) && origin.Equals(other.origin);
         }
@@ -626,7 +624,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other transform to compare.</param>
         /// <returns>Whether or not the matrices are approximately equal.</returns>
-        public bool IsEqualApprox(Transform2D other)
+        public readonly bool IsEqualApprox(Transform2D other)
         {
             return x.IsEqualApprox(other.x) && y.IsEqualApprox(other.y) && origin.IsEqualApprox(other.origin);
         }
@@ -635,7 +633,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Transform2D"/>.
         /// </summary>
         /// <returns>A hash code for this transform.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return x.GetHashCode() ^ y.GetHashCode() ^ origin.GetHashCode();
         }
@@ -644,7 +642,7 @@ namespace Godot
         /// Converts this <see cref="Transform2D"/> to a string.
         /// </summary>
         /// <returns>A string representation of this transform.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"[X: {x}, Y: {y}, O: {origin}]";
         }
@@ -653,7 +651,7 @@ namespace Godot
         /// Converts this <see cref="Transform2D"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this transform.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"[X: {x.ToString(format)}, Y: {y.ToString(format)}, O: {origin.ToString(format)}]";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform3D.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform3D.cs
index 2f7891e7ef..39167bd116 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform3D.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Transform3D.cs
@@ -37,7 +37,7 @@ namespace Godot
         /// </exception>
         public Vector3 this[int column]
         {
-            get
+            readonly get
             {
                 switch (column)
                 {
@@ -83,7 +83,7 @@ namespace Godot
         /// <param name="row">Which row, the matrix vertical position.</param>
         public real_t this[int column, int row]
         {
-            get
+            readonly get
             {
                 if (column == 3)
                 {
@@ -108,7 +108,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="Inverse"/>
         /// <returns>The inverse transformation matrix.</returns>
-        public Transform3D AffineInverse()
+        public readonly Transform3D AffineInverse()
         {
             Basis basisInv = basis.Inverse();
             return new Transform3D(basisInv, basisInv * -origin);
@@ -120,7 +120,7 @@ namespace Godot
         /// <param name="transform">The other transform.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated transform.</returns>
-        public Transform3D InterpolateWith(Transform3D transform, real_t weight)
+        public readonly Transform3D InterpolateWith(Transform3D transform, real_t weight)
         {
             Basis retBasis = basis.Lerp(transform.basis, weight);
             Vector3 retOrigin = origin.Lerp(transform.origin, weight);
@@ -133,7 +133,7 @@ namespace Godot
         /// (no scaling, use <see cref="AffineInverse"/> for transforms with scaling).
         /// </summary>
         /// <returns>The inverse matrix.</returns>
-        public Transform3D Inverse()
+        public readonly Transform3D Inverse()
         {
             Basis basisTr = basis.Transposed();
             return new Transform3D(basisTr, basisTr * -origin);
@@ -164,7 +164,7 @@ namespace Godot
         /// and normalized axis vectors (scale of 1 or -1).
         /// </summary>
         /// <returns>The orthonormalized transform.</returns>
-        public Transform3D Orthonormalized()
+        public readonly Transform3D Orthonormalized()
         {
             return new Transform3D(basis.Orthonormalized(), origin);
         }
@@ -192,7 +192,7 @@ namespace Godot
         /// <param name="axis">The axis to rotate around. Must be normalized.</param>
         /// <param name="angle">The angle to rotate, in radians.</param>
         /// <returns>The rotated transformation matrix.</returns>
-        public Transform3D RotatedLocal(Vector3 axis, real_t angle)
+        public readonly Transform3D RotatedLocal(Vector3 axis, real_t angle)
         {
             Basis tmpBasis = new Basis(axis, angle);
             return new Transform3D(basis * tmpBasis, origin);
@@ -205,7 +205,7 @@ namespace Godot
         /// </summary>
         /// <param name="scale">The scale to introduce.</param>
         /// <returns>The scaled transformation matrix.</returns>
-        public Transform3D Scaled(Vector3 scale)
+        public readonly Transform3D Scaled(Vector3 scale)
         {
             return new Transform3D(basis.Scaled(scale), origin * scale);
         }
@@ -217,7 +217,7 @@ namespace Godot
         /// </summary>
         /// <param name="scale">The scale to introduce.</param>
         /// <returns>The scaled transformation matrix.</returns>
-        public Transform3D ScaledLocal(Vector3 scale)
+        public readonly Transform3D ScaledLocal(Vector3 scale)
         {
             Basis tmpBasis = Basis.FromScale(scale);
             return new Transform3D(basis * tmpBasis, origin);
@@ -230,7 +230,7 @@ namespace Godot
         /// <param name="transform">The other transform.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated transform.</returns>
-        public Transform3D SphericalInterpolateWith(Transform3D transform, real_t weight)
+        public readonly Transform3D SphericalInterpolateWith(Transform3D transform, real_t weight)
         {
             /* not sure if very "efficient" but good enough? */
 
@@ -281,7 +281,7 @@ namespace Godot
         /// </summary>
         /// <param name="offset">The offset to translate by.</param>
         /// <returns>The translated matrix.</returns>
-        public Transform3D Translated(Vector3 offset)
+        public readonly Transform3D Translated(Vector3 offset)
         {
             return new Transform3D(basis, origin + offset);
         }
@@ -293,7 +293,7 @@ namespace Godot
         /// </summary>
         /// <param name="offset">The offset to translate by.</param>
         /// <returns>The translated matrix.</returns>
-        public Transform3D TranslatedLocal(Vector3 offset)
+        public readonly Transform3D TranslatedLocal(Vector3 offset)
         {
             return new Transform3D(basis, new Vector3
             (
@@ -617,7 +617,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other transform to compare.</param>
         /// <returns>Whether or not the matrices are approximately equal.</returns>
-        public bool IsEqualApprox(Transform3D other)
+        public readonly bool IsEqualApprox(Transform3D other)
         {
             return basis.IsEqualApprox(other.basis) && origin.IsEqualApprox(other.origin);
         }
@@ -626,7 +626,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Transform3D"/>.
         /// </summary>
         /// <returns>A hash code for this transform.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return basis.GetHashCode() ^ origin.GetHashCode();
         }
@@ -635,7 +635,7 @@ namespace Godot
         /// Converts this <see cref="Transform3D"/> to a string.
         /// </summary>
         /// <returns>A string representation of this transform.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"[X: {basis.x}, Y: {basis.y}, Z: {basis.z}, O: {origin}]";
         }
@@ -644,7 +644,7 @@ namespace Godot
         /// Converts this <see cref="Transform3D"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this transform.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"[X: {basis.x.ToString(format)}, Y: {basis.y.ToString(format)}, Z: {basis.z.ToString(format)}, O: {origin.ToString(format)}]";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector2.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector2.cs
index 87f397891e..535391f447 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector2.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector2.cs
@@ -48,7 +48,7 @@ namespace Godot
         /// </value>
         public real_t this[int index]
         {
-            get
+            readonly get
             {
                 switch (index)
                 {
@@ -79,7 +79,7 @@ namespace Godot
         /// <summary>
         /// Helper method for deconstruction into a tuple.
         /// </summary>
-        public void Deconstruct(out real_t x, out real_t y)
+        public readonly void Deconstruct(out real_t x, out real_t y)
         {
             x = this.x;
             y = this.y;
@@ -105,7 +105,7 @@ namespace Godot
         /// Returns a new vector with all components in absolute values (i.e. positive).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Abs(real_t)"/> called on each component.</returns>
-        public Vector2 Abs()
+        public readonly Vector2 Abs()
         {
             return new Vector2(Mathf.Abs(x), Mathf.Abs(y));
         }
@@ -117,7 +117,7 @@ namespace Godot
         /// called with the vector's <see cref="y"/> and <see cref="x"/> as parameters: <c>Mathf.Atan2(v.y, v.x)</c>.
         /// </summary>
         /// <returns>The angle of this vector, in radians.</returns>
-        public real_t Angle()
+        public readonly real_t Angle()
         {
             return Mathf.Atan2(y, x);
         }
@@ -127,7 +127,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to compare this vector to.</param>
         /// <returns>The angle between the two vectors, in radians.</returns>
-        public real_t AngleTo(Vector2 to)
+        public readonly real_t AngleTo(Vector2 to)
         {
             return Mathf.Atan2(Cross(to), Dot(to));
         }
@@ -137,7 +137,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to compare this vector to.</param>
         /// <returns>The angle between the two vectors, in radians.</returns>
-        public real_t AngleToPoint(Vector2 to)
+        public readonly real_t AngleToPoint(Vector2 to)
         {
             return Mathf.Atan2(y - to.y, x - to.x);
         }
@@ -146,7 +146,7 @@ namespace Godot
         /// Returns the aspect ratio of this vector, the ratio of <see cref="x"/> to <see cref="y"/>.
         /// </summary>
         /// <returns>The <see cref="x"/> component divided by the <see cref="y"/> component.</returns>
-        public real_t Aspect()
+        public readonly real_t Aspect()
         {
             return x / y;
         }
@@ -156,7 +156,7 @@ namespace Godot
         /// </summary>
         /// <param name="normal">The normal vector defining the plane to bounce off. Must be normalized.</param>
         /// <returns>The bounced vector.</returns>
-        public Vector2 Bounce(Vector2 normal)
+        public readonly Vector2 Bounce(Vector2 normal)
         {
             return -Reflect(normal);
         }
@@ -165,7 +165,7 @@ namespace Godot
         /// Returns a new vector with all components rounded up (towards positive infinity).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Ceil"/> called on each component.</returns>
-        public Vector2 Ceil()
+        public readonly Vector2 Ceil()
         {
             return new Vector2(Mathf.Ceil(x), Mathf.Ceil(y));
         }
@@ -178,7 +178,7 @@ namespace Godot
         /// <param name="min">The vector with minimum allowed values.</param>
         /// <param name="max">The vector with maximum allowed values.</param>
         /// <returns>The vector with all components clamped.</returns>
-        public Vector2 Clamp(Vector2 min, Vector2 max)
+        public readonly Vector2 Clamp(Vector2 min, Vector2 max)
         {
             return new Vector2
             (
@@ -192,7 +192,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector.</param>
         /// <returns>The cross product value.</returns>
-        public real_t Cross(Vector2 with)
+        public readonly real_t Cross(Vector2 with)
         {
             return (x * with.y) - (y * with.x);
         }
@@ -206,7 +206,7 @@ namespace Godot
         /// <param name="postB">A vector after <paramref name="b"/>.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated vector.</returns>
-        public Vector2 CubicInterpolate(Vector2 b, Vector2 preA, Vector2 postB, real_t weight)
+        public readonly Vector2 CubicInterpolate(Vector2 b, Vector2 preA, Vector2 postB, real_t weight)
         {
             return new Vector2
             (
@@ -229,7 +229,7 @@ namespace Godot
         /// <param name="preAT"></param>
         /// <param name="postBT"></param>
         /// <returns>The interpolated vector.</returns>
-        public Vector2 CubicInterpolateInTime(Vector2 b, Vector2 preA, Vector2 postB, real_t weight, real_t t, real_t preAT, real_t postBT)
+        public readonly Vector2 CubicInterpolateInTime(Vector2 b, Vector2 preA, Vector2 postB, real_t weight, real_t t, real_t preAT, real_t postBT)
         {
             return new Vector2
             (
@@ -247,7 +247,7 @@ namespace Godot
         /// <param name="end">The destination vector.</param>
         /// <param name="t">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated vector.</returns>
-        public Vector2 BezierInterpolate(Vector2 control1, Vector2 control2, Vector2 end, real_t t)
+        public readonly Vector2 BezierInterpolate(Vector2 control1, Vector2 control2, Vector2 end, real_t t)
         {
             // Formula from Wikipedia article on Bezier curves
             real_t omt = 1 - t;
@@ -264,7 +264,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to point towards.</param>
         /// <returns>The direction from this vector to <paramref name="to"/>.</returns>
-        public Vector2 DirectionTo(Vector2 to)
+        public readonly Vector2 DirectionTo(Vector2 to)
         {
             return new Vector2(to.x - x, to.y - y).Normalized();
         }
@@ -276,7 +276,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The squared distance between the two vectors.</returns>
-        public real_t DistanceSquaredTo(Vector2 to)
+        public readonly real_t DistanceSquaredTo(Vector2 to)
         {
             return (x - to.x) * (x - to.x) + (y - to.y) * (y - to.y);
         }
@@ -286,7 +286,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The distance between the two vectors.</returns>
-        public real_t DistanceTo(Vector2 to)
+        public readonly real_t DistanceTo(Vector2 to)
         {
             return Mathf.Sqrt((x - to.x) * (x - to.x) + (y - to.y) * (y - to.y));
         }
@@ -296,7 +296,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector to use.</param>
         /// <returns>The dot product of the two vectors.</returns>
-        public real_t Dot(Vector2 with)
+        public readonly real_t Dot(Vector2 with)
         {
             return (x * with.x) + (y * with.y);
         }
@@ -305,7 +305,7 @@ namespace Godot
         /// Returns a new vector with all components rounded down (towards negative infinity).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Floor"/> called on each component.</returns>
-        public Vector2 Floor()
+        public readonly Vector2 Floor()
         {
             return new Vector2(Mathf.Floor(x), Mathf.Floor(y));
         }
@@ -314,7 +314,7 @@ namespace Godot
         /// Returns the inverse of this vector. This is the same as <c>new Vector2(1 / v.x, 1 / v.y)</c>.
         /// </summary>
         /// <returns>The inverse of this vector.</returns>
-        public Vector2 Inverse()
+        public readonly Vector2 Inverse()
         {
             return new Vector2(1 / x, 1 / y);
         }
@@ -323,7 +323,7 @@ namespace Godot
         /// Returns <see langword="true"/> if the vector is normalized, and <see langword="false"/> otherwise.
         /// </summary>
         /// <returns>A <see langword="bool"/> indicating whether or not the vector is normalized.</returns>
-        public bool IsNormalized()
+        public readonly bool IsNormalized()
         {
             return Mathf.Abs(LengthSquared() - 1.0f) < Mathf.Epsilon;
         }
@@ -333,7 +333,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="LengthSquared"/>
         /// <returns>The length of this vector.</returns>
-        public real_t Length()
+        public readonly real_t Length()
         {
             return Mathf.Sqrt((x * x) + (y * y));
         }
@@ -344,7 +344,7 @@ namespace Godot
         /// you need to compare vectors or need the squared length for some formula.
         /// </summary>
         /// <returns>The squared length of this vector.</returns>
-        public real_t LengthSquared()
+        public readonly real_t LengthSquared()
         {
             return (x * x) + (y * y);
         }
@@ -356,7 +356,7 @@ namespace Godot
         /// <param name="to">The destination vector for interpolation.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting vector of the interpolation.</returns>
-        public Vector2 Lerp(Vector2 to, real_t weight)
+        public readonly Vector2 Lerp(Vector2 to, real_t weight)
         {
             return new Vector2
             (
@@ -374,7 +374,7 @@ namespace Godot
         /// A vector with components on the range of 0.0 to 1.0, representing the amount of interpolation.
         /// </param>
         /// <returns>The resulting vector of the interpolation.</returns>
-        public Vector2 Lerp(Vector2 to, Vector2 weight)
+        public readonly Vector2 Lerp(Vector2 to, Vector2 weight)
         {
             return new Vector2
             (
@@ -388,7 +388,7 @@ namespace Godot
         /// </summary>
         /// <param name="length">The length to limit to.</param>
         /// <returns>The vector with its length limited.</returns>
-        public Vector2 LimitLength(real_t length = 1.0f)
+        public readonly Vector2 LimitLength(real_t length = 1.0f)
         {
             Vector2 v = this;
             real_t l = Length();
@@ -407,7 +407,7 @@ namespace Godot
         /// If both components are equal, this method returns <see cref="Axis.X"/>.
         /// </summary>
         /// <returns>The index of the highest axis.</returns>
-        public Axis MaxAxisIndex()
+        public readonly Axis MaxAxisIndex()
         {
             return x < y ? Axis.Y : Axis.X;
         }
@@ -417,7 +417,7 @@ namespace Godot
         /// If both components are equal, this method returns <see cref="Axis.Y"/>.
         /// </summary>
         /// <returns>The index of the lowest axis.</returns>
-        public Axis MinAxisIndex()
+        public readonly Axis MinAxisIndex()
         {
             return x < y ? Axis.X : Axis.Y;
         }
@@ -428,7 +428,7 @@ namespace Godot
         /// <param name="to">The vector to move towards.</param>
         /// <param name="delta">The amount to move towards by.</param>
         /// <returns>The resulting vector.</returns>
-        public Vector2 MoveToward(Vector2 to, real_t delta)
+        public readonly Vector2 MoveToward(Vector2 to, real_t delta)
         {
             Vector2 v = this;
             Vector2 vd = to - v;
@@ -443,7 +443,7 @@ namespace Godot
         /// Returns the vector scaled to unit length. Equivalent to <c>v / v.Length()</c>.
         /// </summary>
         /// <returns>A normalized version of the vector.</returns>
-        public Vector2 Normalized()
+        public readonly Vector2 Normalized()
         {
             Vector2 v = this;
             v.Normalize();
@@ -458,7 +458,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(real_t, real_t)"/> by <paramref name="mod"/>.
         /// </returns>
-        public Vector2 PosMod(real_t mod)
+        public readonly Vector2 PosMod(real_t mod)
         {
             Vector2 v;
             v.x = Mathf.PosMod(x, mod);
@@ -474,7 +474,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(real_t, real_t)"/> by <paramref name="modv"/>'s components.
         /// </returns>
-        public Vector2 PosMod(Vector2 modv)
+        public readonly Vector2 PosMod(Vector2 modv)
         {
             Vector2 v;
             v.x = Mathf.PosMod(x, modv.x);
@@ -487,7 +487,7 @@ namespace Godot
         /// </summary>
         /// <param name="onNormal">The vector to project onto.</param>
         /// <returns>The projected vector.</returns>
-        public Vector2 Project(Vector2 onNormal)
+        public readonly Vector2 Project(Vector2 onNormal)
         {
             return onNormal * (Dot(onNormal) / onNormal.LengthSquared());
         }
@@ -497,7 +497,7 @@ namespace Godot
         /// </summary>
         /// <param name="normal">The normal vector defining the plane to reflect from. Must be normalized.</param>
         /// <returns>The reflected vector.</returns>
-        public Vector2 Reflect(Vector2 normal)
+        public readonly Vector2 Reflect(Vector2 normal)
         {
 #if DEBUG
             if (!normal.IsNormalized())
@@ -513,7 +513,7 @@ namespace Godot
         /// </summary>
         /// <param name="angle">The angle to rotate by, in radians.</param>
         /// <returns>The rotated vector.</returns>
-        public Vector2 Rotated(real_t angle)
+        public readonly Vector2 Rotated(real_t angle)
         {
             real_t sine = Mathf.Sin(angle);
             real_t cosi = Mathf.Cos(angle);
@@ -527,7 +527,7 @@ namespace Godot
         /// with halfway cases rounded towards the nearest multiple of two.
         /// </summary>
         /// <returns>The rounded vector.</returns>
-        public Vector2 Round()
+        public readonly Vector2 Round()
         {
             return new Vector2(Mathf.Round(x), Mathf.Round(y));
         }
@@ -538,7 +538,7 @@ namespace Godot
         /// by calling <see cref="Mathf.Sign(real_t)"/> on each component.
         /// </summary>
         /// <returns>A vector with all components as either <c>1</c>, <c>-1</c>, or <c>0</c>.</returns>
-        public Vector2 Sign()
+        public readonly Vector2 Sign()
         {
             Vector2 v;
             v.x = Mathf.Sign(x);
@@ -557,7 +557,7 @@ namespace Godot
         /// <param name="to">The destination vector for interpolation.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting vector of the interpolation.</returns>
-        public Vector2 Slerp(Vector2 to, real_t weight)
+        public readonly Vector2 Slerp(Vector2 to, real_t weight)
         {
             real_t startLengthSquared = LengthSquared();
             real_t endLengthSquared = to.LengthSquared();
@@ -577,7 +577,7 @@ namespace Godot
         /// </summary>
         /// <param name="normal">The normal vector defining the plane to slide on.</param>
         /// <returns>The slid vector.</returns>
-        public Vector2 Slide(Vector2 normal)
+        public readonly Vector2 Slide(Vector2 normal)
         {
             return this - (normal * Dot(normal));
         }
@@ -588,7 +588,7 @@ namespace Godot
         /// </summary>
         /// <param name="step">A vector value representing the step size to snap to.</param>
         /// <returns>The snapped vector.</returns>
-        public Vector2 Snapped(Vector2 step)
+        public readonly Vector2 Snapped(Vector2 step)
         {
             return new Vector2(Mathf.Snapped(x, step.x), Mathf.Snapped(y, step.y));
         }
@@ -598,7 +598,7 @@ namespace Godot
         /// compared to the original, with the same length.
         /// </summary>
         /// <returns>The perpendicular vector.</returns>
-        public Vector2 Orthogonal()
+        public readonly Vector2 Orthogonal()
         {
             return new Vector2(y, -x);
         }
@@ -946,7 +946,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the vector and the object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Vector2 other && Equals(other);
         }
@@ -958,7 +958,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector.</param>
         /// <returns>Whether or not the vectors are exactly equal.</returns>
-        public bool Equals(Vector2 other)
+        public readonly bool Equals(Vector2 other)
         {
             return x == other.x && y == other.y;
         }
@@ -969,7 +969,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector to compare.</param>
         /// <returns>Whether or not the vectors are approximately equal.</returns>
-        public bool IsEqualApprox(Vector2 other)
+        public readonly bool IsEqualApprox(Vector2 other)
         {
             return Mathf.IsEqualApprox(x, other.x) && Mathf.IsEqualApprox(y, other.y);
         }
@@ -978,7 +978,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Vector2"/>.
         /// </summary>
         /// <returns>A hash code for this vector.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return y.GetHashCode() ^ x.GetHashCode();
         }
@@ -987,7 +987,7 @@ namespace Godot
         /// Converts this <see cref="Vector2"/> to a string.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"({x}, {y})";
         }
@@ -996,7 +996,7 @@ namespace Godot
         /// Converts this <see cref="Vector2"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"({x.ToString(format)}, {y.ToString(format)})";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector2i.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector2i.cs
index bdadf696e3..08f2a3a8af 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector2i.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector2i.cs
@@ -48,7 +48,7 @@ namespace Godot
         /// </value>
         public int this[int index]
         {
-            get
+            readonly get
             {
                 switch (index)
                 {
@@ -79,7 +79,7 @@ namespace Godot
         /// <summary>
         /// Helper method for deconstruction into a tuple.
         /// </summary>
-        public void Deconstruct(out int x, out int y)
+        public readonly void Deconstruct(out int x, out int y)
         {
             x = this.x;
             y = this.y;
@@ -89,7 +89,7 @@ namespace Godot
         /// Returns a new vector with all components in absolute values (i.e. positive).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Abs(int)"/> called on each component.</returns>
-        public Vector2i Abs()
+        public readonly Vector2i Abs()
         {
             return new Vector2i(Mathf.Abs(x), Mathf.Abs(y));
         }
@@ -101,7 +101,7 @@ namespace Godot
         /// called with the vector's <see cref="y"/> and <see cref="x"/> as parameters: <c>Mathf.Atan2(v.y, v.x)</c>.
         /// </summary>
         /// <returns>The angle of this vector, in radians.</returns>
-        public real_t Angle()
+        public readonly real_t Angle()
         {
             return Mathf.Atan2(y, x);
         }
@@ -111,7 +111,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to compare this vector to.</param>
         /// <returns>The angle between the two vectors, in radians.</returns>
-        public real_t AngleTo(Vector2i to)
+        public readonly real_t AngleTo(Vector2i to)
         {
             return Mathf.Atan2(Cross(to), Dot(to));
         }
@@ -121,7 +121,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to compare this vector to.</param>
         /// <returns>The angle between the two vectors, in radians.</returns>
-        public real_t AngleToPoint(Vector2i to)
+        public readonly real_t AngleToPoint(Vector2i to)
         {
             return Mathf.Atan2(y - to.y, x - to.x);
         }
@@ -130,7 +130,7 @@ namespace Godot
         /// Returns the aspect ratio of this vector, the ratio of <see cref="x"/> to <see cref="y"/>.
         /// </summary>
         /// <returns>The <see cref="x"/> component divided by the <see cref="y"/> component.</returns>
-        public real_t Aspect()
+        public readonly real_t Aspect()
         {
             return x / (real_t)y;
         }
@@ -143,7 +143,7 @@ namespace Godot
         /// <param name="min">The vector with minimum allowed values.</param>
         /// <param name="max">The vector with maximum allowed values.</param>
         /// <returns>The vector with all components clamped.</returns>
-        public Vector2i Clamp(Vector2i min, Vector2i max)
+        public readonly Vector2i Clamp(Vector2i min, Vector2i max)
         {
             return new Vector2i
             (
@@ -157,7 +157,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector.</param>
         /// <returns>The cross product vector.</returns>
-        public int Cross(Vector2i with)
+        public readonly int Cross(Vector2i with)
         {
             return x * with.y - y * with.x;
         }
@@ -169,7 +169,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The squared distance between the two vectors.</returns>
-        public int DistanceSquaredTo(Vector2i to)
+        public readonly int DistanceSquaredTo(Vector2i to)
         {
             return (to - this).LengthSquared();
         }
@@ -179,7 +179,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The distance between the two vectors.</returns>
-        public real_t DistanceTo(Vector2i to)
+        public readonly real_t DistanceTo(Vector2i to)
         {
             return (to - this).Length();
         }
@@ -189,7 +189,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector to use.</param>
         /// <returns>The dot product of the two vectors.</returns>
-        public int Dot(Vector2i with)
+        public readonly int Dot(Vector2i with)
         {
             return x * with.x + y * with.y;
         }
@@ -199,7 +199,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="LengthSquared"/>
         /// <returns>The length of this vector.</returns>
-        public real_t Length()
+        public readonly real_t Length()
         {
             int x2 = x * x;
             int y2 = y * y;
@@ -213,7 +213,7 @@ namespace Godot
         /// you need to compare vectors or need the squared length for some formula.
         /// </summary>
         /// <returns>The squared length of this vector.</returns>
-        public int LengthSquared()
+        public readonly int LengthSquared()
         {
             int x2 = x * x;
             int y2 = y * y;
@@ -226,7 +226,7 @@ namespace Godot
         /// If both components are equal, this method returns <see cref="Axis.X"/>.
         /// </summary>
         /// <returns>The index of the highest axis.</returns>
-        public Axis MaxAxisIndex()
+        public readonly Axis MaxAxisIndex()
         {
             return x < y ? Axis.Y : Axis.X;
         }
@@ -236,7 +236,7 @@ namespace Godot
         /// If both components are equal, this method returns <see cref="Axis.Y"/>.
         /// </summary>
         /// <returns>The index of the lowest axis.</returns>
-        public Axis MinAxisIndex()
+        public readonly Axis MinAxisIndex()
         {
             return x < y ? Axis.X : Axis.Y;
         }
@@ -249,7 +249,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(int, int)"/> by <paramref name="mod"/>.
         /// </returns>
-        public Vector2i PosMod(int mod)
+        public readonly Vector2i PosMod(int mod)
         {
             Vector2i v = this;
             v.x = Mathf.PosMod(v.x, mod);
@@ -265,7 +265,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(int, int)"/> by <paramref name="modv"/>'s components.
         /// </returns>
-        public Vector2i PosMod(Vector2i modv)
+        public readonly Vector2i PosMod(Vector2i modv)
         {
             Vector2i v = this;
             v.x = Mathf.PosMod(v.x, modv.x);
@@ -279,7 +279,7 @@ namespace Godot
         /// by calling <see cref="Mathf.Sign(int)"/> on each component.
         /// </summary>
         /// <returns>A vector with all components as either <c>1</c>, <c>-1</c>, or <c>0</c>.</returns>
-        public Vector2i Sign()
+        public readonly Vector2i Sign()
         {
             Vector2i v = this;
             v.x = Mathf.Sign(v.x);
@@ -292,7 +292,7 @@ namespace Godot
         /// compared to the original, with the same length.
         /// </summary>
         /// <returns>The perpendicular vector.</returns>
-        public Vector2i Orthogonal()
+        public readonly Vector2i Orthogonal()
         {
             return new Vector2i(y, -x);
         }
@@ -665,7 +665,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the vector and the object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Vector2i other && Equals(other);
         }
@@ -675,7 +675,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector.</param>
         /// <returns>Whether or not the vectors are equal.</returns>
-        public bool Equals(Vector2i other)
+        public readonly bool Equals(Vector2i other)
         {
             return x == other.x && y == other.y;
         }
@@ -684,7 +684,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Vector2i"/>.
         /// </summary>
         /// <returns>A hash code for this vector.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return y.GetHashCode() ^ x.GetHashCode();
         }
@@ -693,7 +693,7 @@ namespace Godot
         /// Converts this <see cref="Vector2i"/> to a string.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"({x}, {y})";
         }
@@ -702,7 +702,7 @@ namespace Godot
         /// Converts this <see cref="Vector2i"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"({x.ToString(format)}, {y.ToString(format)})";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector3.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector3.cs
index 6649f3b784..53bd0b0908 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector3.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector3.cs
@@ -58,7 +58,7 @@ namespace Godot
         /// </value>
         public real_t this[int index]
         {
-            get
+            readonly get
             {
                 switch (index)
                 {
@@ -94,7 +94,7 @@ namespace Godot
         /// <summary>
         /// Helper method for deconstruction into a tuple.
         /// </summary>
-        public void Deconstruct(out real_t x, out real_t y, out real_t z)
+        public readonly void Deconstruct(out real_t x, out real_t y, out real_t z)
         {
             x = this.x;
             y = this.y;
@@ -122,7 +122,7 @@ namespace Godot
         /// Returns a new vector with all components in absolute values (i.e. positive).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Abs(real_t)"/> called on each component.</returns>
-        public Vector3 Abs()
+        public readonly Vector3 Abs()
         {
             return new Vector3(Mathf.Abs(x), Mathf.Abs(y), Mathf.Abs(z));
         }
@@ -132,7 +132,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to compare this vector to.</param>
         /// <returns>The unsigned angle between the two vectors, in radians.</returns>
-        public real_t AngleTo(Vector3 to)
+        public readonly real_t AngleTo(Vector3 to)
         {
             return Mathf.Atan2(Cross(to).Length(), Dot(to));
         }
@@ -142,7 +142,7 @@ namespace Godot
         /// </summary>
         /// <param name="normal">The normal vector defining the plane to bounce off. Must be normalized.</param>
         /// <returns>The bounced vector.</returns>
-        public Vector3 Bounce(Vector3 normal)
+        public readonly Vector3 Bounce(Vector3 normal)
         {
             return -Reflect(normal);
         }
@@ -151,7 +151,7 @@ namespace Godot
         /// Returns a new vector with all components rounded up (towards positive infinity).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Ceil"/> called on each component.</returns>
-        public Vector3 Ceil()
+        public readonly Vector3 Ceil()
         {
             return new Vector3(Mathf.Ceil(x), Mathf.Ceil(y), Mathf.Ceil(z));
         }
@@ -164,7 +164,7 @@ namespace Godot
         /// <param name="min">The vector with minimum allowed values.</param>
         /// <param name="max">The vector with maximum allowed values.</param>
         /// <returns>The vector with all components clamped.</returns>
-        public Vector3 Clamp(Vector3 min, Vector3 max)
+        public readonly Vector3 Clamp(Vector3 min, Vector3 max)
         {
             return new Vector3
             (
@@ -179,7 +179,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector.</param>
         /// <returns>The cross product vector.</returns>
-        public Vector3 Cross(Vector3 with)
+        public readonly Vector3 Cross(Vector3 with)
         {
             return new Vector3
             (
@@ -198,7 +198,7 @@ namespace Godot
         /// <param name="postB">A vector after <paramref name="b"/>.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated vector.</returns>
-        public Vector3 CubicInterpolate(Vector3 b, Vector3 preA, Vector3 postB, real_t weight)
+        public readonly Vector3 CubicInterpolate(Vector3 b, Vector3 preA, Vector3 postB, real_t weight)
         {
             return new Vector3
             (
@@ -222,7 +222,7 @@ namespace Godot
         /// <param name="preAT"></param>
         /// <param name="postBT"></param>
         /// <returns>The interpolated vector.</returns>
-        public Vector3 CubicInterpolateInTime(Vector3 b, Vector3 preA, Vector3 postB, real_t weight, real_t t, real_t preAT, real_t postBT)
+        public readonly Vector3 CubicInterpolateInTime(Vector3 b, Vector3 preA, Vector3 postB, real_t weight, real_t t, real_t preAT, real_t postBT)
         {
             return new Vector3
             (
@@ -241,7 +241,7 @@ namespace Godot
         /// <param name="end">The destination vector.</param>
         /// <param name="t">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated vector.</returns>
-        public Vector3 BezierInterpolate(Vector3 control1, Vector3 control2, Vector3 end, real_t t)
+        public readonly Vector3 BezierInterpolate(Vector3 control1, Vector3 control2, Vector3 end, real_t t)
         {
             // Formula from Wikipedia article on Bezier curves
             real_t omt = 1 - t;
@@ -258,7 +258,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to point towards.</param>
         /// <returns>The direction from this vector to <paramref name="to"/>.</returns>
-        public Vector3 DirectionTo(Vector3 to)
+        public readonly Vector3 DirectionTo(Vector3 to)
         {
             return new Vector3(to.x - x, to.y - y, to.z - z).Normalized();
         }
@@ -270,7 +270,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The squared distance between the two vectors.</returns>
-        public real_t DistanceSquaredTo(Vector3 to)
+        public readonly real_t DistanceSquaredTo(Vector3 to)
         {
             return (to - this).LengthSquared();
         }
@@ -281,7 +281,7 @@ namespace Godot
         /// <seealso cref="DistanceSquaredTo(Vector3)"/>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The distance between the two vectors.</returns>
-        public real_t DistanceTo(Vector3 to)
+        public readonly real_t DistanceTo(Vector3 to)
         {
             return (to - this).Length();
         }
@@ -291,7 +291,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector to use.</param>
         /// <returns>The dot product of the two vectors.</returns>
-        public real_t Dot(Vector3 with)
+        public readonly real_t Dot(Vector3 with)
         {
             return (x * with.x) + (y * with.y) + (z * with.z);
         }
@@ -300,7 +300,7 @@ namespace Godot
         /// Returns a new vector with all components rounded down (towards negative infinity).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Floor"/> called on each component.</returns>
-        public Vector3 Floor()
+        public readonly Vector3 Floor()
         {
             return new Vector3(Mathf.Floor(x), Mathf.Floor(y), Mathf.Floor(z));
         }
@@ -309,7 +309,7 @@ namespace Godot
         /// Returns the inverse of this vector. This is the same as <c>new Vector3(1 / v.x, 1 / v.y, 1 / v.z)</c>.
         /// </summary>
         /// <returns>The inverse of this vector.</returns>
-        public Vector3 Inverse()
+        public readonly Vector3 Inverse()
         {
             return new Vector3(1 / x, 1 / y, 1 / z);
         }
@@ -318,7 +318,7 @@ namespace Godot
         /// Returns <see langword="true"/> if the vector is normalized, and <see langword="false"/> otherwise.
         /// </summary>
         /// <returns>A <see langword="bool"/> indicating whether or not the vector is normalized.</returns>
-        public bool IsNormalized()
+        public readonly bool IsNormalized()
         {
             return Mathf.Abs(LengthSquared() - 1.0f) < Mathf.Epsilon;
         }
@@ -328,7 +328,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="LengthSquared"/>
         /// <returns>The length of this vector.</returns>
-        public real_t Length()
+        public readonly real_t Length()
         {
             real_t x2 = x * x;
             real_t y2 = y * y;
@@ -343,7 +343,7 @@ namespace Godot
         /// you need to compare vectors or need the squared length for some formula.
         /// </summary>
         /// <returns>The squared length of this vector.</returns>
-        public real_t LengthSquared()
+        public readonly real_t LengthSquared()
         {
             real_t x2 = x * x;
             real_t y2 = y * y;
@@ -359,7 +359,7 @@ namespace Godot
         /// <param name="to">The destination vector for interpolation.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting vector of the interpolation.</returns>
-        public Vector3 Lerp(Vector3 to, real_t weight)
+        public readonly Vector3 Lerp(Vector3 to, real_t weight)
         {
             return new Vector3
             (
@@ -376,7 +376,7 @@ namespace Godot
         /// <param name="to">The destination vector for interpolation.</param>
         /// <param name="weight">A vector with components on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting vector of the interpolation.</returns>
-        public Vector3 Lerp(Vector3 to, Vector3 weight)
+        public readonly Vector3 Lerp(Vector3 to, Vector3 weight)
         {
             return new Vector3
             (
@@ -391,7 +391,7 @@ namespace Godot
         /// </summary>
         /// <param name="length">The length to limit to.</param>
         /// <returns>The vector with its length limited.</returns>
-        public Vector3 LimitLength(real_t length = 1.0f)
+        public readonly Vector3 LimitLength(real_t length = 1.0f)
         {
             Vector3 v = this;
             real_t l = Length();
@@ -410,7 +410,7 @@ namespace Godot
         /// If all components are equal, this method returns <see cref="Axis.X"/>.
         /// </summary>
         /// <returns>The index of the highest axis.</returns>
-        public Axis MaxAxisIndex()
+        public readonly Axis MaxAxisIndex()
         {
             return x < y ? (y < z ? Axis.Z : Axis.Y) : (x < z ? Axis.Z : Axis.X);
         }
@@ -420,7 +420,7 @@ namespace Godot
         /// If all components are equal, this method returns <see cref="Axis.Z"/>.
         /// </summary>
         /// <returns>The index of the lowest axis.</returns>
-        public Axis MinAxisIndex()
+        public readonly Axis MinAxisIndex()
         {
             return x < y ? (x < z ? Axis.X : Axis.Z) : (y < z ? Axis.Y : Axis.Z);
         }
@@ -431,7 +431,7 @@ namespace Godot
         /// <param name="to">The vector to move towards.</param>
         /// <param name="delta">The amount to move towards by.</param>
         /// <returns>The resulting vector.</returns>
-        public Vector3 MoveToward(Vector3 to, real_t delta)
+        public readonly Vector3 MoveToward(Vector3 to, real_t delta)
         {
             Vector3 v = this;
             Vector3 vd = to - v;
@@ -446,7 +446,7 @@ namespace Godot
         /// Returns the vector scaled to unit length. Equivalent to <c>v / v.Length()</c>.
         /// </summary>
         /// <returns>A normalized version of the vector.</returns>
-        public Vector3 Normalized()
+        public readonly Vector3 Normalized()
         {
             Vector3 v = this;
             v.Normalize();
@@ -458,7 +458,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector.</param>
         /// <returns>A <see cref="Basis"/> representing the outer product matrix.</returns>
-        public Basis Outer(Vector3 with)
+        public readonly Basis Outer(Vector3 with)
         {
             return new Basis(
                 x * with.x, x * with.y, x * with.z,
@@ -475,7 +475,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(real_t, real_t)"/> by <paramref name="mod"/>.
         /// </returns>
-        public Vector3 PosMod(real_t mod)
+        public readonly Vector3 PosMod(real_t mod)
         {
             Vector3 v;
             v.x = Mathf.PosMod(x, mod);
@@ -492,7 +492,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(real_t, real_t)"/> by <paramref name="modv"/>'s components.
         /// </returns>
-        public Vector3 PosMod(Vector3 modv)
+        public readonly Vector3 PosMod(Vector3 modv)
         {
             Vector3 v;
             v.x = Mathf.PosMod(x, modv.x);
@@ -506,7 +506,7 @@ namespace Godot
         /// </summary>
         /// <param name="onNormal">The vector to project onto.</param>
         /// <returns>The projected vector.</returns>
-        public Vector3 Project(Vector3 onNormal)
+        public readonly Vector3 Project(Vector3 onNormal)
         {
             return onNormal * (Dot(onNormal) / onNormal.LengthSquared());
         }
@@ -516,7 +516,7 @@ namespace Godot
         /// </summary>
         /// <param name="normal">The normal vector defining the plane to reflect from. Must be normalized.</param>
         /// <returns>The reflected vector.</returns>
-        public Vector3 Reflect(Vector3 normal)
+        public readonly Vector3 Reflect(Vector3 normal)
         {
 #if DEBUG
             if (!normal.IsNormalized())
@@ -534,7 +534,7 @@ namespace Godot
         /// <param name="axis">The vector to rotate around. Must be normalized.</param>
         /// <param name="angle">The angle to rotate by, in radians.</param>
         /// <returns>The rotated vector.</returns>
-        public Vector3 Rotated(Vector3 axis, real_t angle)
+        public readonly Vector3 Rotated(Vector3 axis, real_t angle)
         {
 #if DEBUG
             if (!axis.IsNormalized())
@@ -550,7 +550,7 @@ namespace Godot
         /// with halfway cases rounded towards the nearest multiple of two.
         /// </summary>
         /// <returns>The rounded vector.</returns>
-        public Vector3 Round()
+        public readonly Vector3 Round()
         {
             return new Vector3(Mathf.Round(x), Mathf.Round(y), Mathf.Round(z));
         }
@@ -561,7 +561,7 @@ namespace Godot
         /// by calling <see cref="Mathf.Sign(real_t)"/> on each component.
         /// </summary>
         /// <returns>A vector with all components as either <c>1</c>, <c>-1</c>, or <c>0</c>.</returns>
-        public Vector3 Sign()
+        public readonly Vector3 Sign()
         {
             Vector3 v;
             v.x = Mathf.Sign(x);
@@ -579,7 +579,7 @@ namespace Godot
         /// <param name="to">The other vector to compare this vector to.</param>
         /// <param name="axis">The reference axis to use for the angle sign.</param>
         /// <returns>The signed angle between the two vectors, in radians.</returns>
-        public real_t SignedAngleTo(Vector3 to, Vector3 axis)
+        public readonly real_t SignedAngleTo(Vector3 to, Vector3 axis)
         {
             Vector3 crossTo = Cross(to);
             real_t unsignedAngle = Mathf.Atan2(crossTo.Length(), Dot(to));
@@ -598,7 +598,7 @@ namespace Godot
         /// <param name="to">The destination vector for interpolation.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting vector of the interpolation.</returns>
-        public Vector3 Slerp(Vector3 to, real_t weight)
+        public readonly Vector3 Slerp(Vector3 to, real_t weight)
         {
             real_t startLengthSquared = LengthSquared();
             real_t endLengthSquared = to.LengthSquared();
@@ -618,7 +618,7 @@ namespace Godot
         /// </summary>
         /// <param name="normal">The normal vector defining the plane to slide on.</param>
         /// <returns>The slid vector.</returns>
-        public Vector3 Slide(Vector3 normal)
+        public readonly Vector3 Slide(Vector3 normal)
         {
             return this - (normal * Dot(normal));
         }
@@ -629,7 +629,7 @@ namespace Godot
         /// </summary>
         /// <param name="step">A vector value representing the step size to snap to.</param>
         /// <returns>The snapped vector.</returns>
-        public Vector3 Snapped(Vector3 step)
+        public readonly Vector3 Snapped(Vector3 step)
         {
             return new Vector3
             (
@@ -1015,7 +1015,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the vector and the object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Vector3 other && Equals(other);
         }
@@ -1027,7 +1027,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector.</param>
         /// <returns>Whether or not the vectors are exactly equal.</returns>
-        public bool Equals(Vector3 other)
+        public readonly bool Equals(Vector3 other)
         {
             return x == other.x && y == other.y && z == other.z;
         }
@@ -1038,7 +1038,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector to compare.</param>
         /// <returns>Whether or not the vectors are approximately equal.</returns>
-        public bool IsEqualApprox(Vector3 other)
+        public readonly bool IsEqualApprox(Vector3 other)
         {
             return Mathf.IsEqualApprox(x, other.x) && Mathf.IsEqualApprox(y, other.y) && Mathf.IsEqualApprox(z, other.z);
         }
@@ -1047,7 +1047,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Vector3"/>.
         /// </summary>
         /// <returns>A hash code for this vector.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return y.GetHashCode() ^ x.GetHashCode() ^ z.GetHashCode();
         }
@@ -1056,7 +1056,7 @@ namespace Godot
         /// Converts this <see cref="Vector3"/> to a string.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"({x}, {y}, {z})";
         }
@@ -1065,7 +1065,7 @@ namespace Godot
         /// Converts this <see cref="Vector3"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"({x.ToString(format)}, {y.ToString(format)}, {z.ToString(format)})";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector3i.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector3i.cs
index e88a043cb3..e631a9f443 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector3i.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector3i.cs
@@ -58,7 +58,7 @@ namespace Godot
         /// </value>
         public int this[int index]
         {
-            get
+            readonly get
             {
                 switch (index)
                 {
@@ -94,7 +94,7 @@ namespace Godot
         /// <summary>
         /// Helper method for deconstruction into a tuple.
         /// </summary>
-        public void Deconstruct(out int x, out int y, out int z)
+        public readonly void Deconstruct(out int x, out int y, out int z)
         {
             x = this.x;
             y = this.y;
@@ -105,7 +105,7 @@ namespace Godot
         /// Returns a new vector with all components in absolute values (i.e. positive).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Abs(int)"/> called on each component.</returns>
-        public Vector3i Abs()
+        public readonly Vector3i Abs()
         {
             return new Vector3i(Mathf.Abs(x), Mathf.Abs(y), Mathf.Abs(z));
         }
@@ -118,7 +118,7 @@ namespace Godot
         /// <param name="min">The vector with minimum allowed values.</param>
         /// <param name="max">The vector with maximum allowed values.</param>
         /// <returns>The vector with all components clamped.</returns>
-        public Vector3i Clamp(Vector3i min, Vector3i max)
+        public readonly Vector3i Clamp(Vector3i min, Vector3i max)
         {
             return new Vector3i
             (
@@ -135,7 +135,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The squared distance between the two vectors.</returns>
-        public int DistanceSquaredTo(Vector3i to)
+        public readonly int DistanceSquaredTo(Vector3i to)
         {
             return (to - this).LengthSquared();
         }
@@ -146,7 +146,7 @@ namespace Godot
         /// <seealso cref="DistanceSquaredTo(Vector3i)"/>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The distance between the two vectors.</returns>
-        public real_t DistanceTo(Vector3i to)
+        public readonly real_t DistanceTo(Vector3i to)
         {
             return (to - this).Length();
         }
@@ -156,7 +156,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector to use.</param>
         /// <returns>The dot product of the two vectors.</returns>
-        public int Dot(Vector3i with)
+        public readonly int Dot(Vector3i with)
         {
             return x * with.x + y * with.y + z * with.z;
         }
@@ -166,7 +166,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="LengthSquared"/>
         /// <returns>The length of this vector.</returns>
-        public real_t Length()
+        public readonly real_t Length()
         {
             int x2 = x * x;
             int y2 = y * y;
@@ -181,7 +181,7 @@ namespace Godot
         /// you need to compare vectors or need the squared length for some formula.
         /// </summary>
         /// <returns>The squared length of this vector.</returns>
-        public int LengthSquared()
+        public readonly int LengthSquared()
         {
             int x2 = x * x;
             int y2 = y * y;
@@ -195,7 +195,7 @@ namespace Godot
         /// If all components are equal, this method returns <see cref="Axis.X"/>.
         /// </summary>
         /// <returns>The index of the highest axis.</returns>
-        public Axis MaxAxisIndex()
+        public readonly Axis MaxAxisIndex()
         {
             return x < y ? (y < z ? Axis.Z : Axis.Y) : (x < z ? Axis.Z : Axis.X);
         }
@@ -205,7 +205,7 @@ namespace Godot
         /// If all components are equal, this method returns <see cref="Axis.Z"/>.
         /// </summary>
         /// <returns>The index of the lowest axis.</returns>
-        public Axis MinAxisIndex()
+        public readonly Axis MinAxisIndex()
         {
             return x < y ? (x < z ? Axis.X : Axis.Z) : (y < z ? Axis.Y : Axis.Z);
         }
@@ -218,7 +218,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(int, int)"/> by <paramref name="mod"/>.
         /// </returns>
-        public Vector3i PosMod(int mod)
+        public readonly Vector3i PosMod(int mod)
         {
             Vector3i v = this;
             v.x = Mathf.PosMod(v.x, mod);
@@ -235,7 +235,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(int, int)"/> by <paramref name="modv"/>'s components.
         /// </returns>
-        public Vector3i PosMod(Vector3i modv)
+        public readonly Vector3i PosMod(Vector3i modv)
         {
             Vector3i v = this;
             v.x = Mathf.PosMod(v.x, modv.x);
@@ -250,7 +250,7 @@ namespace Godot
         /// by calling <see cref="Mathf.Sign(int)"/> on each component.
         /// </summary>
         /// <returns>A vector with all components as either <c>1</c>, <c>-1</c>, or <c>0</c>.</returns>
-        public Vector3i Sign()
+        public readonly Vector3i Sign()
         {
             Vector3i v = this;
             v.x = Mathf.Sign(v.x);
@@ -674,7 +674,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the vector and the object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Vector3i other && Equals(other);
         }
@@ -684,7 +684,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector.</param>
         /// <returns>Whether or not the vectors are equal.</returns>
-        public bool Equals(Vector3i other)
+        public readonly bool Equals(Vector3i other)
         {
             return x == other.x && y == other.y && z == other.z;
         }
@@ -693,7 +693,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Vector3i"/>.
         /// </summary>
         /// <returns>A hash code for this vector.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return y.GetHashCode() ^ x.GetHashCode() ^ z.GetHashCode();
         }
@@ -702,7 +702,7 @@ namespace Godot
         /// Converts this <see cref="Vector3i"/> to a string.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"({x}, {y}, {z})";
         }
@@ -711,7 +711,7 @@ namespace Godot
         /// Converts this <see cref="Vector3i"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"({x.ToString(format)}, {y.ToString(format)}, {z.ToString(format)})";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector4.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector4.cs
index e2da41ff47..3191e8adc0 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector4.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector4.cs
@@ -68,7 +68,7 @@ namespace Godot
         /// </value>
         public real_t this[int index]
         {
-            get
+            readonly get
             {
                 switch (index)
                 {
@@ -109,7 +109,7 @@ namespace Godot
         /// <summary>
         /// Helper method for deconstruction into a tuple.
         /// </summary>
-        public void Deconstruct(out real_t x, out real_t y, out real_t z, out real_t w)
+        public readonly void Deconstruct(out real_t x, out real_t y, out real_t z, out real_t w)
         {
             x = this.x;
             y = this.y;
@@ -139,7 +139,7 @@ namespace Godot
         /// Returns a new vector with all components in absolute values (i.e. positive).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Abs(real_t)"/> called on each component.</returns>
-        public Vector4 Abs()
+        public readonly Vector4 Abs()
         {
             return new Vector4(Mathf.Abs(x), Mathf.Abs(y), Mathf.Abs(z), Mathf.Abs(w));
         }
@@ -148,7 +148,7 @@ namespace Godot
         /// Returns a new vector with all components rounded up (towards positive infinity).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Ceil"/> called on each component.</returns>
-        public Vector4 Ceil()
+        public readonly Vector4 Ceil()
         {
             return new Vector4(Mathf.Ceil(x), Mathf.Ceil(y), Mathf.Ceil(z), Mathf.Ceil(w));
         }
@@ -161,7 +161,7 @@ namespace Godot
         /// <param name="min">The vector with minimum allowed values.</param>
         /// <param name="max">The vector with maximum allowed values.</param>
         /// <returns>The vector with all components clamped.</returns>
-        public Vector4 Clamp(Vector4 min, Vector4 max)
+        public readonly Vector4 Clamp(Vector4 min, Vector4 max)
         {
             return new Vector4
             (
@@ -181,7 +181,7 @@ namespace Godot
         /// <param name="postB">A vector after <paramref name="b"/>.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The interpolated vector.</returns>
-        public Vector4 CubicInterpolate(Vector4 b, Vector4 preA, Vector4 postB, real_t weight)
+        public readonly Vector4 CubicInterpolate(Vector4 b, Vector4 preA, Vector4 postB, real_t weight)
         {
             return new Vector4
             (
@@ -206,7 +206,7 @@ namespace Godot
         /// <param name="preAT"></param>
         /// <param name="postBT"></param>
         /// <returns>The interpolated vector.</returns>
-        public Vector4 CubicInterpolateInTime(Vector4 b, Vector4 preA, Vector4 postB, real_t weight, real_t t, real_t preAT, real_t postBT)
+        public readonly Vector4 CubicInterpolateInTime(Vector4 b, Vector4 preA, Vector4 postB, real_t weight, real_t t, real_t preAT, real_t postBT)
         {
             return new Vector4
             (
@@ -222,7 +222,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to point towards.</param>
         /// <returns>The direction from this vector to <paramref name="to"/>.</returns>
-        public Vector4 DirectionTo(Vector4 to)
+        public readonly Vector4 DirectionTo(Vector4 to)
         {
             Vector4 ret = new Vector4(to.x - x, to.y - y, to.z - z, to.w - w);
             ret.Normalize();
@@ -236,7 +236,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The squared distance between the two vectors.</returns>
-        public real_t DistanceSquaredTo(Vector4 to)
+        public readonly real_t DistanceSquaredTo(Vector4 to)
         {
             return (to - this).LengthSquared();
         }
@@ -246,7 +246,7 @@ namespace Godot
         /// </summary>
         /// <param name="to">The other vector to use.</param>
         /// <returns>The distance between the two vectors.</returns>
-        public real_t DistanceTo(Vector4 to)
+        public readonly real_t DistanceTo(Vector4 to)
         {
             return (to - this).Length();
         }
@@ -256,7 +256,7 @@ namespace Godot
         /// </summary>
         /// <param name="with">The other vector to use.</param>
         /// <returns>The dot product of the two vectors.</returns>
-        public real_t Dot(Vector4 with)
+        public readonly real_t Dot(Vector4 with)
         {
             return (x * with.x) + (y * with.y) + (z * with.z) + (w * with.w);
         }
@@ -265,7 +265,7 @@ namespace Godot
         /// Returns a new vector with all components rounded down (towards negative infinity).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Floor"/> called on each component.</returns>
-        public Vector4 Floor()
+        public readonly Vector4 Floor()
         {
             return new Vector4(Mathf.Floor(x), Mathf.Floor(y), Mathf.Floor(z), Mathf.Floor(w));
         }
@@ -274,7 +274,7 @@ namespace Godot
         /// Returns the inverse of this vector. This is the same as <c>new Vector4(1 / v.x, 1 / v.y, 1 / v.z, 1 / v.w)</c>.
         /// </summary>
         /// <returns>The inverse of this vector.</returns>
-        public Vector4 Inverse()
+        public readonly Vector4 Inverse()
         {
             return new Vector4(1 / x, 1 / y, 1 / z, 1 / w);
         }
@@ -283,7 +283,7 @@ namespace Godot
         /// Returns <see langword="true"/> if the vector is normalized, and <see langword="false"/> otherwise.
         /// </summary>
         /// <returns>A <see langword="bool"/> indicating whether or not the vector is normalized.</returns>
-        public bool IsNormalized()
+        public readonly bool IsNormalized()
         {
             return Mathf.Abs(LengthSquared() - 1.0f) < Mathf.Epsilon;
         }
@@ -293,7 +293,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="LengthSquared"/>
         /// <returns>The length of this vector.</returns>
-        public real_t Length()
+        public readonly real_t Length()
         {
             real_t x2 = x * x;
             real_t y2 = y * y;
@@ -309,7 +309,7 @@ namespace Godot
         /// you need to compare vectors or need the squared length for some formula.
         /// </summary>
         /// <returns>The squared length of this vector.</returns>
-        public real_t LengthSquared()
+        public readonly real_t LengthSquared()
         {
             real_t x2 = x * x;
             real_t y2 = y * y;
@@ -326,7 +326,7 @@ namespace Godot
         /// <param name="to">The destination vector for interpolation.</param>
         /// <param name="weight">A value on the range of 0.0 to 1.0, representing the amount of interpolation.</param>
         /// <returns>The resulting vector of the interpolation.</returns>
-        public Vector4 Lerp(Vector4 to, real_t weight)
+        public readonly Vector4 Lerp(Vector4 to, real_t weight)
         {
             return new Vector4
             (
@@ -342,7 +342,7 @@ namespace Godot
         /// If all components are equal, this method returns <see cref="Axis.X"/>.
         /// </summary>
         /// <returns>The index of the highest axis.</returns>
-        public Axis MaxAxisIndex()
+        public readonly Axis MaxAxisIndex()
         {
             int max_index = 0;
             real_t max_value = x;
@@ -362,7 +362,7 @@ namespace Godot
         /// If all components are equal, this method returns <see cref="Axis.W"/>.
         /// </summary>
         /// <returns>The index of the lowest axis.</returns>
-        public Axis MinAxisIndex()
+        public readonly Axis MinAxisIndex()
         {
             int min_index = 0;
             real_t min_value = x;
@@ -381,7 +381,7 @@ namespace Godot
         /// Returns the vector scaled to unit length. Equivalent to <c>v / v.Length()</c>.
         /// </summary>
         /// <returns>A normalized version of the vector.</returns>
-        public Vector4 Normalized()
+        public readonly Vector4 Normalized()
         {
             Vector4 v = this;
             v.Normalize();
@@ -396,7 +396,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(real_t, real_t)"/> by <paramref name="mod"/>.
         /// </returns>
-        public Vector4 PosMod(real_t mod)
+        public readonly Vector4 PosMod(real_t mod)
         {
             return new Vector4(
                 Mathf.PosMod(x, mod),
@@ -414,7 +414,7 @@ namespace Godot
         /// <returns>
         /// A vector with each component <see cref="Mathf.PosMod(real_t, real_t)"/> by <paramref name="modv"/>'s components.
         /// </returns>
-        public Vector4 PosMod(Vector4 modv)
+        public readonly Vector4 PosMod(Vector4 modv)
         {
             return new Vector4(
                 Mathf.PosMod(x, modv.x),
@@ -429,7 +429,7 @@ namespace Godot
         /// with halfway cases rounded towards the nearest multiple of two.
         /// </summary>
         /// <returns>The rounded vector.</returns>
-        public Vector4 Round()
+        public readonly Vector4 Round()
         {
             return new Vector4(Mathf.Round(x), Mathf.Round(y), Mathf.Round(z), Mathf.Round(w));
         }
@@ -440,7 +440,7 @@ namespace Godot
         /// by calling <see cref="Mathf.Sign(real_t)"/> on each component.
         /// </summary>
         /// <returns>A vector with all components as either <c>1</c>, <c>-1</c>, or <c>0</c>.</returns>
-        public Vector4 Sign()
+        public readonly Vector4 Sign()
         {
             Vector4 v;
             v.x = Mathf.Sign(x);
@@ -456,7 +456,7 @@ namespace Godot
         /// </summary>
         /// <param name="step">A vector value representing the step size to snap to.</param>
         /// <returns>The snapped vector.</returns>
-        public Vector4 Snapped(Vector4 step)
+        public readonly Vector4 Snapped(Vector4 step)
         {
             return new Vector4(
                 Mathf.Snapped(x, step.x),
@@ -828,7 +828,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the vector and the object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Vector4 other && Equals(other);
         }
@@ -840,7 +840,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector.</param>
         /// <returns>Whether or not the vectors are exactly equal.</returns>
-        public bool Equals(Vector4 other)
+        public readonly bool Equals(Vector4 other)
         {
             return x == other.x && y == other.y && z == other.z && w == other.w;
         }
@@ -851,7 +851,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector to compare.</param>
         /// <returns>Whether or not the vectors are approximately equal.</returns>
-        public bool IsEqualApprox(Vector4 other)
+        public readonly bool IsEqualApprox(Vector4 other)
         {
             return Mathf.IsEqualApprox(x, other.x) && Mathf.IsEqualApprox(y, other.y) && Mathf.IsEqualApprox(z, other.z) && Mathf.IsEqualApprox(w, other.w);
         }
@@ -860,7 +860,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Vector4"/>.
         /// </summary>
         /// <returns>A hash code for this vector.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return y.GetHashCode() ^ x.GetHashCode() ^ z.GetHashCode() ^ w.GetHashCode();
         }
@@ -878,7 +878,7 @@ namespace Godot
         /// Converts this <see cref="Vector4"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"({x.ToString(format)}, {y.ToString(format)}, {z.ToString(format)}, {w.ToString(format)})";
         }
diff --git a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector4i.cs b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector4i.cs
index 4b1bb3ba19..8146991fd7 100644
--- a/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector4i.cs
+++ b/modules/mono/glue/GodotSharp/GodotSharp/Core/Vector4i.cs
@@ -68,7 +68,7 @@ namespace Godot
         /// </value>
         public int this[int index]
         {
-            get
+            readonly get
             {
                 switch (index)
                 {
@@ -109,7 +109,7 @@ namespace Godot
         /// <summary>
         /// Helper method for deconstruction into a tuple.
         /// </summary>
-        public void Deconstruct(out int x, out int y, out int z, out int w)
+        public readonly void Deconstruct(out int x, out int y, out int z, out int w)
         {
             x = this.x;
             y = this.y;
@@ -121,7 +121,7 @@ namespace Godot
         /// Returns a new vector with all components in absolute values (i.e. positive).
         /// </summary>
         /// <returns>A vector with <see cref="Mathf.Abs(int)"/> called on each component.</returns>
-        public Vector4i Abs()
+        public readonly Vector4i Abs()
         {
             return new Vector4i(Mathf.Abs(x), Mathf.Abs(y), Mathf.Abs(z), Mathf.Abs(w));
         }
@@ -134,7 +134,7 @@ namespace Godot
         /// <param name="min">The vector with minimum allowed values.</param>
         /// <param name="max">The vector with maximum allowed values.</param>
         /// <returns>The vector with all components clamped.</returns>
-        public Vector4i Clamp(Vector4i min, Vector4i max)
+        public readonly Vector4i Clamp(Vector4i min, Vector4i max)
         {
             return new Vector4i
             (
@@ -150,7 +150,7 @@ namespace Godot
         /// </summary>
         /// <seealso cref="LengthSquared"/>
         /// <returns>The length of this vector.</returns>
-        public real_t Length()
+        public readonly real_t Length()
         {
             int x2 = x * x;
             int y2 = y * y;
@@ -166,7 +166,7 @@ namespace Godot
         /// you need to compare vectors or need the squared length for some formula.
         /// </summary>
         /// <returns>The squared length of this vector.</returns>
-        public int LengthSquared()
+        public readonly int LengthSquared()
         {
             int x2 = x * x;
             int y2 = y * y;
@@ -181,7 +181,7 @@ namespace Godot
         /// If all components are equal, this method returns <see cref="Axis.X"/>.
         /// </summary>
         /// <returns>The index of the highest axis.</returns>
-        public Axis MaxAxisIndex()
+        public readonly Axis MaxAxisIndex()
         {
             int max_index = 0;
             int max_value = x;
@@ -201,7 +201,7 @@ namespace Godot
         /// If all components are equal, this method returns <see cref="Axis.W"/>.
         /// </summary>
         /// <returns>The index of the lowest axis.</returns>
-        public Axis MinAxisIndex()
+        public readonly Axis MinAxisIndex()
         {
             int min_index = 0;
             int min_value = x;
@@ -222,7 +222,7 @@ namespace Godot
         /// by calling <see cref="Mathf.Sign(int)"/> on each component.
         /// </summary>
         /// <returns>A vector with all components as either <c>1</c>, <c>-1</c>, or <c>0</c>.</returns>
-        public Vector4i Sign()
+        public readonly Vector4i Sign()
         {
             return new Vector4i(Mathf.Sign(x), Mathf.Sign(y), Mathf.Sign(z), Mathf.Sign(w));
         }
@@ -627,7 +627,7 @@ namespace Godot
         /// </summary>
         /// <param name="obj">The object to compare with.</param>
         /// <returns>Whether or not the vector and the object are equal.</returns>
-        public override bool Equals(object obj)
+        public override readonly bool Equals(object obj)
         {
             return obj is Vector4i other && Equals(other);
         }
@@ -637,7 +637,7 @@ namespace Godot
         /// </summary>
         /// <param name="other">The other vector.</param>
         /// <returns>Whether or not the vectors are equal.</returns>
-        public bool Equals(Vector4i other)
+        public readonly bool Equals(Vector4i other)
         {
             return x == other.x && y == other.y && z == other.z && w == other.w;
         }
@@ -646,7 +646,7 @@ namespace Godot
         /// Serves as the hash function for <see cref="Vector4i"/>.
         /// </summary>
         /// <returns>A hash code for this vector.</returns>
-        public override int GetHashCode()
+        public override readonly int GetHashCode()
         {
             return y.GetHashCode() ^ x.GetHashCode() ^ z.GetHashCode() ^ w.GetHashCode();
         }
@@ -655,7 +655,7 @@ namespace Godot
         /// Converts this <see cref="Vector4i"/> to a string.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public override string ToString()
+        public override readonly string ToString()
         {
             return $"({x}, {y}, {z}, {w})";
         }
@@ -664,7 +664,7 @@ namespace Godot
         /// Converts this <see cref="Vector4i"/> to a string with the given <paramref name="format"/>.
         /// </summary>
         /// <returns>A string representation of this vector.</returns>
-        public string ToString(string format)
+        public readonly string ToString(string format)
         {
             return $"({x.ToString(format)}, {y.ToString(format)}, {z.ToString(format)}), {w.ToString(format)})";
         }