11 files changed, 18 insertions, 3 deletions
diff --git a/modules/mono/glue/Managed/Files/AABB.cs b/modules/mono/glue/Managed/Files/AABB.cs
index a2ebbc0736..98a73382f4 100644
--- a/modules/mono/glue/Managed/Files/AABB.cs
+++ b/modules/mono/glue/Managed/Files/AABB.cs
@@ -5,6 +5,7 @@
 // file: core/variant_call.cpp
 // commit: 5ad9be4c24e9d7dc5672fdc42cea896622fe5685
 using System;
+using System.Runtime.InteropServices;
 #if REAL_T_IS_DOUBLE
 using real_t = System.Double;
 #else
@@ -13,6 +14,8 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct AABB : IEquatable<AABB>
     {
         private Vector3 _position;
diff --git a/modules/mono/glue/Managed/Files/Basis.cs b/modules/mono/glue/Managed/Files/Basis.cs
index 5a6a5ff658..421532b68f 100644
--- a/modules/mono/glue/Managed/Files/Basis.cs
+++ b/modules/mono/glue/Managed/Files/Basis.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Basis : IEquatable<Basis>
     {
diff --git a/modules/mono/glue/Managed/Files/Color.cs b/modules/mono/glue/Managed/Files/Color.cs
index da57a7f9ae..447697c671 100644
--- a/modules/mono/glue/Managed/Files/Color.cs
+++ b/modules/mono/glue/Managed/Files/Color.cs
@@ -1,7 +1,10 @@
 using System;
+using System.Runtime.InteropServices;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct Color : IEquatable<Color>
     {
         public float r;
diff --git a/modules/mono/glue/Managed/Files/Plane.cs b/modules/mono/glue/Managed/Files/Plane.cs
index e16d4315be..a13161d2e6 100644
--- a/modules/mono/glue/Managed/Files/Plane.cs
+++ b/modules/mono/glue/Managed/Files/Plane.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Runtime.InteropServices;
 #if REAL_T_IS_DOUBLE
 using real_t = System.Double;
 #else
@@ -7,6 +8,8 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
     public struct Plane : IEquatable<Plane>
     {
         private Vector3 _normal;
diff --git a/modules/mono/glue/Managed/Files/Quat.cs b/modules/mono/glue/Managed/Files/Quat.cs
index f1d97b9b5c..845c7c730e 100644
--- a/modules/mono/glue/Managed/Files/Quat.cs
+++ b/modules/mono/glue/Managed/Files/Quat.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Quat : IEquatable<Quat>
     {
diff --git a/modules/mono/glue/Managed/Files/Rect2.cs b/modules/mono/glue/Managed/Files/Rect2.cs
index 888f300347..f3dc9d8490 100644
--- a/modules/mono/glue/Managed/Files/Rect2.cs
+++ b/modules/mono/glue/Managed/Files/Rect2.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Rect2 : IEquatable<Rect2>
     {
diff --git a/modules/mono/glue/Managed/Files/Transform.cs b/modules/mono/glue/Managed/Files/Transform.cs
index de70ccbe98..cc4d26158d 100644
--- a/modules/mono/glue/Managed/Files/Transform.cs
+++ b/modules/mono/glue/Managed/Files/Transform.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Transform : IEquatable<Transform>
     {
diff --git a/modules/mono/glue/Managed/Files/Transform2D.cs b/modules/mono/glue/Managed/Files/Transform2D.cs
index 12a3811230..814332dc07 100644
--- a/modules/mono/glue/Managed/Files/Transform2D.cs
+++ b/modules/mono/glue/Managed/Files/Transform2D.cs
@@ -8,6 +8,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Transform2D : IEquatable<Transform2D>
     {
diff --git a/modules/mono/glue/Managed/Files/Vector2.cs b/modules/mono/glue/Managed/Files/Vector2.cs
index 3fb40d8a61..b1c1dae3c2 100644
--- a/modules/mono/glue/Managed/Files/Vector2.cs
+++ b/modules/mono/glue/Managed/Files/Vector2.cs
@@ -14,6 +14,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector2 : IEquatable<Vector2>
     {
diff --git a/modules/mono/glue/Managed/Files/Vector3.cs b/modules/mono/glue/Managed/Files/Vector3.cs
index 68601da1e7..c2da7b8bb1 100644
--- a/modules/mono/glue/Managed/Files/Vector3.cs
+++ b/modules/mono/glue/Managed/Files/Vector3.cs
@@ -14,6 +14,7 @@ using real_t = System.Single;
 
 namespace Godot
 {
+    [Serializable]
     [StructLayout(LayoutKind.Sequential)]
     public struct Vector3 : IEquatable<Vector3>
     {
diff --git a/modules/mono/glue/gd_glue.cpp b/modules/mono/glue/gd_glue.cpp
index 7c30092855..27fd715f60 100644
--- a/modules/mono/glue/gd_glue.cpp
+++ b/modules/mono/glue/gd_glue.cpp
@@ -167,7 +167,7 @@ MonoObject *godot_icall_GD_str2var(MonoString *p_str) {
 	int line;
 	Error err = VariantParser::parse(&ss, ret, errs, line);
 	if (err != OK) {
-		String err_str = "Parse error at line " + itos(line) + ": " + errs;
+		String err_str = "Parse error at line " + itos(line) + ": " + errs + ".";
 		ERR_PRINTS(err_str);
 		ret = err_str;
 	}
@@ -193,8 +193,7 @@ MonoArray *godot_icall_GD_var2bytes(MonoObject *p_var, MonoBoolean p_full_object
 	PoolByteArray barr;
 	int len;
 	Error err = encode_variant(var, NULL, len, p_full_objects);
-	ERR_EXPLAIN("Unexpected error encoding variable to bytes, likely unserializable type found (Object or RID).");
-	ERR_FAIL_COND_V(err != OK, NULL);
+	ERR_FAIL_COND_V_MSG(err != OK, NULL, "Unexpected error encoding variable to bytes, likely unserializable type found (Object or RID).");
 
 	barr.resize(len);
 	{