23 files changed, 438 insertions, 85 deletions
diff --git a/core/config/project_settings.cpp b/core/config/project_settings.cpp
index 03892d1d4f..09f9f84728 100644
--- a/core/config/project_settings.cpp
+++ b/core/config/project_settings.cpp
@@ -55,11 +55,7 @@ String ProjectSettings::get_resource_path() const {
 const String ProjectSettings::IMPORTED_FILES_PATH("res://.godot/imported");
 
 String ProjectSettings::localize_path(const String &p_path) const {
-	if (resource_path == "") {
-		return p_path; //not initialized yet
-	}
-
-	if (p_path.begins_with("res://") || p_path.begins_with("user://") ||
+	if (resource_path.is_empty() || p_path.begins_with("res://") || p_path.begins_with("user://") ||
 			(p_path.is_absolute_path() && !p_path.begins_with(resource_path))) {
 		return p_path.simplify_path();
 	}
diff --git a/core/core_bind.cpp b/core/core_bind.cpp
index fd5b3bb731..e029b85450 100644
--- a/core/core_bind.cpp
+++ b/core/core_bind.cpp
@@ -286,6 +286,10 @@ String OS::get_locale() const {
 	return ::OS::get_singleton()->get_locale();
 }
 
+String OS::get_locale_language() const {
+	return ::OS::get_singleton()->get_locale_language();
+}
+
 String OS::get_model_name() const {
 	return ::OS::get_singleton()->get_model_name();
 }
@@ -547,6 +551,7 @@ void OS::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("delay_usec", "usec"), &OS::delay_usec);
 	ClassDB::bind_method(D_METHOD("delay_msec", "msec"), &OS::delay_msec);
 	ClassDB::bind_method(D_METHOD("get_locale"), &OS::get_locale);
+	ClassDB::bind_method(D_METHOD("get_locale_language"), &OS::get_locale_language);
 	ClassDB::bind_method(D_METHOD("get_model_name"), &OS::get_model_name);
 
 	ClassDB::bind_method(D_METHOD("is_userfs_persistent"), &OS::is_userfs_persistent);
@@ -2042,6 +2047,42 @@ StringName ClassDB::get_category(const StringName &p_node) const {
 	return ::ClassDB::get_category(p_node);
 }
 
+bool ClassDB::has_enum(const StringName &p_class, const StringName &p_name, bool p_no_inheritance) const {
+	return ::ClassDB::has_enum(p_class, p_name, p_no_inheritance);
+}
+
+PackedStringArray ClassDB::get_enum_list(const StringName &p_class, bool p_no_inheritance) const {
+	List<StringName> enums;
+	::ClassDB::get_enum_list(p_class, &enums, p_no_inheritance);
+
+	PackedStringArray ret;
+	ret.resize(enums.size());
+	int idx = 0;
+	for (const StringName &E : enums) {
+		ret.set(idx++, E);
+	}
+
+	return ret;
+}
+
+PackedStringArray ClassDB::get_enum_constants(const StringName &p_class, const StringName &p_enum, bool p_no_inheritance) const {
+	List<StringName> constants;
+	::ClassDB::get_enum_constants(p_class, p_enum, &constants, p_no_inheritance);
+
+	PackedStringArray ret;
+	ret.resize(constants.size());
+	int idx = 0;
+	for (const StringName &E : constants) {
+		ret.set(idx++, E);
+	}
+
+	return ret;
+}
+
+StringName ClassDB::get_integer_constant_enum(const StringName &p_class, const StringName &p_name, bool p_no_inheritance) const {
+	return ::ClassDB::get_integer_constant_enum(p_class, p_name, p_no_inheritance);
+}
+
 bool ClassDB::is_class_enabled(StringName p_class) const {
 	return ::ClassDB::is_class_enabled(p_class);
 }
@@ -2072,6 +2113,11 @@ void ClassDB::_bind_methods() {
 	::ClassDB::bind_method(D_METHOD("class_has_integer_constant", "class", "name"), &ClassDB::has_integer_constant);
 	::ClassDB::bind_method(D_METHOD("class_get_integer_constant", "class", "name"), &ClassDB::get_integer_constant);
 
+	::ClassDB::bind_method(D_METHOD("class_has_enum", "class", "name", "no_inheritance"), &ClassDB::has_enum, DEFVAL(false));
+	::ClassDB::bind_method(D_METHOD("class_get_enum_list", "class", "no_inheritance"), &ClassDB::get_enum_list, DEFVAL(false));
+	::ClassDB::bind_method(D_METHOD("class_get_enum_constants", "class", "enum", "no_inheritance"), &ClassDB::get_enum_constants, DEFVAL(false));
+	::ClassDB::bind_method(D_METHOD("class_get_integer_constant_enum", "class", "name", "no_inheritance"), &ClassDB::get_integer_constant_enum, DEFVAL(false));
+
 	::ClassDB::bind_method(D_METHOD("class_get_category", "class"), &ClassDB::get_category);
 	::ClassDB::bind_method(D_METHOD("is_class_enabled", "class"), &ClassDB::is_class_enabled);
 }
diff --git a/core/core_bind.h b/core/core_bind.h
index a6fac63edd..a5d5a7c8ce 100644
--- a/core/core_bind.h
+++ b/core/core_bind.h
@@ -178,6 +178,7 @@ public:
 	Vector<String> get_cmdline_args();
 
 	String get_locale() const;
+	String get_locale_language() const;
 
 	String get_model_name() const;
 
@@ -592,6 +593,11 @@ public:
 	int get_integer_constant(const StringName &p_class, const StringName &p_name) const;
 	StringName get_category(const StringName &p_node) const;
 
+	bool has_enum(const StringName &p_class, const StringName &p_name, bool p_no_inheritance = false) const;
+	PackedStringArray get_enum_list(const StringName &p_class, bool p_no_inheritance = false) const;
+	PackedStringArray get_enum_constants(const StringName &p_class, const StringName &p_enum, bool p_no_inheritance = false) const;
+	StringName get_integer_constant_enum(const StringName &p_class, const StringName &p_name, bool p_no_inheritance = false) const;
+
 	bool is_class_enabled(StringName p_class) const;
 
 	ClassDB() {}
diff --git a/core/extension/gdnative_interface.cpp b/core/extension/gdnative_interface.cpp
index a65bdd16dc..b41f74a4bc 100644
--- a/core/extension/gdnative_interface.cpp
+++ b/core/extension/gdnative_interface.cpp
@@ -771,6 +771,18 @@ static GDNativeTypePtr gdnative_packed_vector3_array_operator_index_const(const
 	return (GDNativeTypePtr)&self->ptr()[p_index];
 }
 
+static GDNativeVariantPtr gdnative_array_operator_index(GDNativeTypePtr p_self, GDNativeInt p_index) {
+	Array *self = (Array *)p_self;
+	ERR_FAIL_INDEX_V(p_index, self->size(), nullptr);
+	return (GDNativeTypePtr)&self[p_index];
+}
+
+static GDNativeVariantPtr gdnative_array_operator_index_const(const GDNativeTypePtr p_self, GDNativeInt p_index) {
+	const Array *self = (const Array *)p_self;
+	ERR_FAIL_INDEX_V(p_index, self->size(), nullptr);
+	return (GDNativeTypePtr)&self[p_index];
+}
+
 /* OBJECT API */
 
 static void gdnative_object_method_bind_call(const GDNativeMethodBindPtr p_method_bind, GDNativeObjectPtr p_instance, const GDNativeVariantPtr *p_args, GDNativeInt p_arg_count, GDNativeVariantPtr r_return, GDNativeCallError *r_error) {
@@ -979,6 +991,9 @@ void gdnative_setup_interface(GDNativeInterface *p_interface) {
 	gdni.packed_vector3_array_operator_index = gdnative_packed_vector3_array_operator_index;
 	gdni.packed_vector3_array_operator_index_const = gdnative_packed_vector3_array_operator_index_const;
 
+	gdni.array_operator_index = gdnative_array_operator_index;
+	gdni.array_operator_index_const = gdnative_array_operator_index_const;
+
 	/* OBJECT */
 
 	gdni.object_method_bind_call = gdnative_object_method_bind_call;
@@ -1005,6 +1020,8 @@ void gdnative_setup_interface(GDNativeInterface *p_interface) {
 	gdni.classdb_register_extension_class_method = nullptr;
 	gdni.classdb_register_extension_class_integer_constant = nullptr;
 	gdni.classdb_register_extension_class_property = nullptr;
+	gdni.classdb_register_extension_class_property_group = nullptr;
+	gdni.classdb_register_extension_class_property_subgroup = nullptr;
 	gdni.classdb_register_extension_class_signal = nullptr;
 	gdni.classdb_unregister_extension_class = nullptr;
 }
diff --git a/core/extension/gdnative_interface.h b/core/extension/gdnative_interface.h
index 30346f233f..df735db9b6 100644
--- a/core/extension/gdnative_interface.h
+++ b/core/extension/gdnative_interface.h
@@ -413,6 +413,9 @@ typedef struct {
 	GDNativeTypePtr (*packed_vector3_array_operator_index)(GDNativeTypePtr p_self, GDNativeInt p_index); // p_self should be a PackedVector3Array, returns Vector3 ptr
 	GDNativeTypePtr (*packed_vector3_array_operator_index_const)(const GDNativeTypePtr p_self, GDNativeInt p_index); // p_self should be a PackedVector3Array, returns Vector3 ptr
 
+	GDNativeVariantPtr (*array_operator_index)(GDNativeTypePtr p_self, GDNativeInt p_index); // p_self should be an Array ptr
+	GDNativeVariantPtr (*array_operator_index_const)(const GDNativeTypePtr p_self, GDNativeInt p_index); // p_self should be an Array ptr
+
 	/* OBJECT */
 
 	void (*object_method_bind_call)(const GDNativeMethodBindPtr p_method_bind, GDNativeObjectPtr p_instance, const GDNativeVariantPtr *p_args, GDNativeInt p_arg_count, GDNativeVariantPtr r_ret, GDNativeCallError *r_error);
@@ -438,6 +441,8 @@ typedef struct {
 	void (*classdb_register_extension_class_method)(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const GDNativeExtensionClassMethodInfo *p_method_info);
 	void (*classdb_register_extension_class_integer_constant)(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_enum_name, const char *p_constant_name, GDNativeInt p_constant_value);
 	void (*classdb_register_extension_class_property)(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const GDNativePropertyInfo *p_info, const char *p_setter, const char *p_getter);
+	void (*classdb_register_extension_class_property_group)(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_group_name, const char *p_prefix);
+	void (*classdb_register_extension_class_property_subgroup)(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_subgroup_name, const char *p_prefix);
 	void (*classdb_register_extension_class_signal)(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_signal_name, const GDNativePropertyInfo *p_argument_info, GDNativeInt p_argument_count);
 	void (*classdb_unregister_extension_class)(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name); /* Unregistering a parent class before a class that inherits it will result in failure. Inheritors must be unregistered first. */
 } GDNativeInterface;
diff --git a/core/extension/native_extension.cpp b/core/extension/native_extension.cpp
index a3cd7ca14c..635e53fa9c 100644
--- a/core/extension/native_extension.cpp
+++ b/core/extension/native_extension.cpp
@@ -184,6 +184,7 @@ void NativeExtension::_register_extension_class_integer_constant(const GDNativeE
 
 	ClassDB::bind_integer_constant(class_name, p_enum_name, p_constant_name, p_constant_value);
 }
+
 void NativeExtension::_register_extension_class_property(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const GDNativePropertyInfo *p_info, const char *p_setter, const char *p_getter) {
 	NativeExtension *self = (NativeExtension *)p_library;
 
@@ -202,6 +203,24 @@ void NativeExtension::_register_extension_class_property(const GDNativeExtension
 	ClassDB::add_property(class_name, pinfo, p_setter, p_getter);
 }
 
+void NativeExtension::_register_extension_class_property_group(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_group_name, const char *p_prefix) {
+	NativeExtension *self = (NativeExtension *)p_library;
+
+	StringName class_name = p_class_name;
+	ERR_FAIL_COND_MSG(!self->extension_classes.has(class_name), "Attempt to register extension class property group '" + String(p_group_name) + "' for unexisting class '" + class_name + "'.");
+
+	ClassDB::add_property_group(class_name, p_group_name, p_prefix);
+}
+
+void NativeExtension::_register_extension_class_property_subgroup(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_subgroup_name, const char *p_prefix) {
+	NativeExtension *self = (NativeExtension *)p_library;
+
+	StringName class_name = p_class_name;
+	ERR_FAIL_COND_MSG(!self->extension_classes.has(class_name), "Attempt to register extension class property subgroup '" + String(p_subgroup_name) + "' for unexisting class '" + class_name + "'.");
+
+	ClassDB::add_property_subgroup(class_name, p_subgroup_name, p_prefix);
+}
+
 void NativeExtension::_register_extension_class_signal(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_signal_name, const GDNativePropertyInfo *p_argument_info, GDNativeInt p_argument_count) {
 	NativeExtension *self = (NativeExtension *)p_library;
 
@@ -325,6 +344,8 @@ void NativeExtension::initialize_native_extensions() {
 	gdnative_interface.classdb_register_extension_class_method = _register_extension_class_method;
 	gdnative_interface.classdb_register_extension_class_integer_constant = _register_extension_class_integer_constant;
 	gdnative_interface.classdb_register_extension_class_property = _register_extension_class_property;
+	gdnative_interface.classdb_register_extension_class_property_group = _register_extension_class_property_group;
+	gdnative_interface.classdb_register_extension_class_property_subgroup = _register_extension_class_property_subgroup;
 	gdnative_interface.classdb_register_extension_class_signal = _register_extension_class_signal;
 	gdnative_interface.classdb_unregister_extension_class = _unregister_extension_class;
 }
diff --git a/core/extension/native_extension.h b/core/extension/native_extension.h
index 9b1ebe0ed7..52e869ad4d 100644
--- a/core/extension/native_extension.h
+++ b/core/extension/native_extension.h
@@ -50,6 +50,8 @@ class NativeExtension : public Resource {
 	static void _register_extension_class_method(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const GDNativeExtensionClassMethodInfo *p_method_info);
 	static void _register_extension_class_integer_constant(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_enum_name, const char *p_constant_name, GDNativeInt p_constant_value);
 	static void _register_extension_class_property(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const GDNativePropertyInfo *p_info, const char *p_setter, const char *p_getter);
+	static void _register_extension_class_property_group(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_group_name, const char *p_prefix);
+	static void _register_extension_class_property_subgroup(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_subgroup_name, const char *p_prefix);
 	static void _register_extension_class_signal(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name, const char *p_signal_name, const GDNativePropertyInfo *p_argument_info, GDNativeInt p_argument_count);
 	static void _unregister_extension_class(const GDNativeExtensionClassLibraryPtr p_library, const char *p_class_name);
 
diff --git a/core/math/a_star.cpp b/core/math/a_star.cpp
index b380860522..d59dbf1ba8 100644
--- a/core/math/a_star.cpp
+++ b/core/math/a_star.cpp
@@ -47,8 +47,8 @@ int AStar::get_available_point_id() const {
 }
 
 void AStar::add_point(int p_id, const Vector3 &p_pos, real_t p_weight_scale) {
-	ERR_FAIL_COND(p_id < 0);
-	ERR_FAIL_COND(p_weight_scale < 1);
+	ERR_FAIL_COND_MSG(p_id < 0, vformat("Can't add a point with negative id: %d.", p_id));
+	ERR_FAIL_COND_MSG(p_weight_scale < 1, vformat("Can't add a point with weight scale less than one: %f.", p_weight_scale));
 
 	Point *found_pt;
 	bool p_exists = points.lookup(p_id, found_pt);
@@ -72,7 +72,7 @@ void AStar::add_point(int p_id, const Vector3 &p_pos, real_t p_weight_scale) {
 Vector3 AStar::get_point_position(int p_id) const {
 	Point *p;
 	bool p_exists = points.lookup(p_id, p);
-	ERR_FAIL_COND_V(!p_exists, Vector3());
+	ERR_FAIL_COND_V_MSG(!p_exists, Vector3(), vformat("Can't get point's position. Point with id: %d doesn't exist.", p_id));
 
 	return p->pos;
 }
@@ -80,7 +80,7 @@ Vector3 AStar::get_point_position(int p_id) const {
 void AStar::set_point_position(int p_id, const Vector3 &p_pos) {
 	Point *p;
 	bool p_exists = points.lookup(p_id, p);
-	ERR_FAIL_COND(!p_exists);
+	ERR_FAIL_COND_MSG(!p_exists, vformat("Can't set point's position. Point with id: %d doesn't exist.", p_id));
 
 	p->pos = p_pos;
 }
@@ -88,7 +88,7 @@ void AStar::set_point_position(int p_id, const Vector3 &p_pos) {
 real_t AStar::get_point_weight_scale(int p_id) const {
 	Point *p;
 	bool p_exists = points.lookup(p_id, p);
-	ERR_FAIL_COND_V(!p_exists, 0);
+	ERR_FAIL_COND_V_MSG(!p_exists, 0, vformat("Can't get point's weight scale. Point with id: %d doesn't exist.", p_id));
 
 	return p->weight_scale;
 }
@@ -96,8 +96,8 @@ real_t AStar::get_point_weight_scale(int p_id) const {
 void AStar::set_point_weight_scale(int p_id, real_t p_weight_scale) {
 	Point *p;
 	bool p_exists = points.lookup(p_id, p);
-	ERR_FAIL_COND(!p_exists);
-	ERR_FAIL_COND(p_weight_scale < 1);
+	ERR_FAIL_COND_MSG(!p_exists, vformat("Can't set point's weight scale. Point with id: %d doesn't exist.", p_id));
+	ERR_FAIL_COND_MSG(p_weight_scale < 1, vformat("Can't set point's weight scale less than one: %f.", p_weight_scale));
 
 	p->weight_scale = p_weight_scale;
 }
@@ -105,7 +105,7 @@ void AStar::set_point_weight_scale(int p_id, real_t p_weight_scale) {
 void AStar::remove_point(int p_id) {
 	Point *p;
 	bool p_exists = points.lookup(p_id, p);
-	ERR_FAIL_COND(!p_exists);
+	ERR_FAIL_COND_MSG(!p_exists, vformat("Can't remove point. Point with id: %d doesn't exist.", p_id));
 
 	for (OAHashMap<int, Point *>::Iterator it = p->neighbours.iter(); it.valid; it = p->neighbours.next_iter(it)) {
 		Segment s(p_id, (*it.key));
@@ -129,15 +129,15 @@ void AStar::remove_point(int p_id) {
 }
 
 void AStar::connect_points(int p_id, int p_with_id, bool bidirectional) {
-	ERR_FAIL_COND(p_id == p_with_id);
+	ERR_FAIL_COND_MSG(p_id == p_with_id, vformat("Can't connect point with id: %d to itself.", p_id));
 
 	Point *a;
 	bool from_exists = points.lookup(p_id, a);
-	ERR_FAIL_COND(!from_exists);
+	ERR_FAIL_COND_MSG(!from_exists, vformat("Can't connect points. Point with id: %d doesn't exist.", p_id));
 
 	Point *b;
 	bool to_exists = points.lookup(p_with_id, b);
-	ERR_FAIL_COND(!to_exists);
+	ERR_FAIL_COND_MSG(!to_exists, vformat("Can't connect points. Point with id: %d doesn't exist.", p_with_id));
 
 	a->neighbours.set(b->id, b);
 
@@ -169,11 +169,11 @@ void AStar::connect_points(int p_id, int p_with_id, bool bidirectional) {
 void AStar::disconnect_points(int p_id, int p_with_id, bool bidirectional) {
 	Point *a;
 	bool a_exists = points.lookup(p_id, a);
-	ERR_FAIL_COND(!a_exists);
+	ERR_FAIL_COND_MSG(!a_exists, vformat("Can't disconnect points. Point with id: %d doesn't exist.", p_id));
 
 	Point *b;
 	bool b_exists = points.lookup(p_with_id, b);
-	ERR_FAIL_COND(!b_exists);
+	ERR_FAIL_COND_MSG(!b_exists, vformat("Can't disconnect points. Point with id: %d doesn't exist.", p_with_id));
 
 	Segment s(p_id, p_with_id);
 	int remove_direction = bidirectional ? (int)Segment::BIDIRECTIONAL : s.direction;
@@ -223,7 +223,7 @@ Array AStar::get_points() {
 Vector<int> AStar::get_point_connections(int p_id) {
 	Point *p;
 	bool p_exists = points.lookup(p_id, p);
-	ERR_FAIL_COND_V(!p_exists, Vector<int>());
+	ERR_FAIL_COND_V_MSG(!p_exists, Vector<int>(), vformat("Can't get point's connections. Point with id: %d doesn't exist.", p_id));
 
 	Vector<int> point_list;
 
@@ -260,8 +260,8 @@ int AStar::get_point_capacity() const {
 }
 
 void AStar::reserve_space(int p_num_nodes) {
-	ERR_FAIL_COND_MSG(p_num_nodes <= 0, "New capacity must be greater than 0, was: " + itos(p_num_nodes) + ".");
-	ERR_FAIL_COND_MSG((uint32_t)p_num_nodes < points.get_capacity(), "New capacity must be greater than current capacity: " + itos(points.get_capacity()) + ", new was: " + itos(p_num_nodes) + ".");
+	ERR_FAIL_COND_MSG(p_num_nodes <= 0, vformat("New capacity must be greater than 0, new was: %d.", p_num_nodes));
+	ERR_FAIL_COND_MSG((uint32_t)p_num_nodes < points.get_capacity(), vformat("New capacity must be greater than current capacity: %d, new was: %d.", points.get_capacity(), p_num_nodes));
 	points.reserve(p_num_nodes);
 }
 
@@ -389,11 +389,11 @@ real_t AStar::_estimate_cost(int p_from_id, int p_to_id) {
 
 	Point *from_point;
 	bool from_exists = points.lookup(p_from_id, from_point);
-	ERR_FAIL_COND_V(!from_exists, 0);
+	ERR_FAIL_COND_V_MSG(!from_exists, 0, vformat("Can't estimate cost. Point with id: %d doesn't exist.", p_from_id));
 
 	Point *to_point;
 	bool to_exists = points.lookup(p_to_id, to_point);
-	ERR_FAIL_COND_V(!to_exists, 0);
+	ERR_FAIL_COND_V_MSG(!to_exists, 0, vformat("Can't estimate cost. Point with id: %d doesn't exist.", p_to_id));
 
 	return from_point->pos.distance_to(to_point->pos);
 }
@@ -406,11 +406,11 @@ real_t AStar::_compute_cost(int p_from_id, int p_to_id) {
 
 	Point *from_point;
 	bool from_exists = points.lookup(p_from_id, from_point);
-	ERR_FAIL_COND_V(!from_exists, 0);
+	ERR_FAIL_COND_V_MSG(!from_exists, 0, vformat("Can't compute cost. Point with id: %d doesn't exist.", p_from_id));
 
 	Point *to_point;
 	bool to_exists = points.lookup(p_to_id, to_point);
-	ERR_FAIL_COND_V(!to_exists, 0);
+	ERR_FAIL_COND_V_MSG(!to_exists, 0, vformat("Can't compute cost. Point with id: %d doesn't exist.", p_to_id));
 
 	return from_point->pos.distance_to(to_point->pos);
 }
@@ -418,11 +418,11 @@ real_t AStar::_compute_cost(int p_from_id, int p_to_id) {
 Vector<Vector3> AStar::get_point_path(int p_from_id, int p_to_id) {
 	Point *a;
 	bool from_exists = points.lookup(p_from_id, a);
-	ERR_FAIL_COND_V(!from_exists, Vector<Vector3>());
+	ERR_FAIL_COND_V_MSG(!from_exists, Vector<Vector3>(), vformat("Can't get point path. Point with id: %d doesn't exist.", p_from_id));
 
 	Point *b;
 	bool to_exists = points.lookup(p_to_id, b);
-	ERR_FAIL_COND_V(!to_exists, Vector<Vector3>());
+	ERR_FAIL_COND_V_MSG(!to_exists, Vector<Vector3>(), vformat("Can't get point path. Point with id: %d doesn't exist.", p_to_id));
 
 	if (a == b) {
 		Vector<Vector3> ret;
@@ -467,11 +467,11 @@ Vector<Vector3> AStar::get_point_path(int p_from_id, int p_to_id) {
 Vector<int> AStar::get_id_path(int p_from_id, int p_to_id) {
 	Point *a;
 	bool from_exists = points.lookup(p_from_id, a);
-	ERR_FAIL_COND_V(!from_exists, Vector<int>());
+	ERR_FAIL_COND_V_MSG(!from_exists, Vector<int>(), vformat("Can't get id path. Point with id: %d doesn't exist.", p_from_id));
 
 	Point *b;
 	bool to_exists = points.lookup(p_to_id, b);
-	ERR_FAIL_COND_V(!to_exists, Vector<int>());
+	ERR_FAIL_COND_V_MSG(!to_exists, Vector<int>(), vformat("Can't get id path. Point with id: %d doesn't exist.", p_to_id));
 
 	if (a == b) {
 		Vector<int> ret;
@@ -516,7 +516,7 @@ Vector<int> AStar::get_id_path(int p_from_id, int p_to_id) {
 void AStar::set_point_disabled(int p_id, bool p_disabled) {
 	Point *p;
 	bool p_exists = points.lookup(p_id, p);
-	ERR_FAIL_COND(!p_exists);
+	ERR_FAIL_COND_MSG(!p_exists, vformat("Can't set if point is disabled. Point with id: %d doesn't exist.", p_id));
 
 	p->enabled = !p_disabled;
 }
@@ -524,7 +524,7 @@ void AStar::set_point_disabled(int p_id, bool p_disabled) {
 bool AStar::is_point_disabled(int p_id) const {
 	Point *p;
 	bool p_exists = points.lookup(p_id, p);
-	ERR_FAIL_COND_V(!p_exists, false);
+	ERR_FAIL_COND_V_MSG(!p_exists, false, vformat("Can't get if point is disabled. Point with id: %d doesn't exist.", p_id));
 
 	return !p->enabled;
 }
@@ -663,11 +663,11 @@ real_t AStar2D::_estimate_cost(int p_from_id, int p_to_id) {
 
 	AStar::Point *from_point;
 	bool from_exists = astar.points.lookup(p_from_id, from_point);
-	ERR_FAIL_COND_V(!from_exists, 0);
+	ERR_FAIL_COND_V_MSG(!from_exists, 0, vformat("Can't estimate cost. Point with id: %d doesn't exist.", p_from_id));
 
 	AStar::Point *to_point;
 	bool to_exists = astar.points.lookup(p_to_id, to_point);
-	ERR_FAIL_COND_V(!to_exists, 0);
+	ERR_FAIL_COND_V_MSG(!to_exists, 0, vformat("Can't estimate cost. Point with id: %d doesn't exist.", p_to_id));
 
 	return from_point->pos.distance_to(to_point->pos);
 }
@@ -680,11 +680,11 @@ real_t AStar2D::_compute_cost(int p_from_id, int p_to_id) {
 
 	AStar::Point *from_point;
 	bool from_exists = astar.points.lookup(p_from_id, from_point);
-	ERR_FAIL_COND_V(!from_exists, 0);
+	ERR_FAIL_COND_V_MSG(!from_exists, 0, vformat("Can't compute cost. Point with id: %d doesn't exist.", p_from_id));
 
 	AStar::Point *to_point;
 	bool to_exists = astar.points.lookup(p_to_id, to_point);
-	ERR_FAIL_COND_V(!to_exists, 0);
+	ERR_FAIL_COND_V_MSG(!to_exists, 0, vformat("Can't compute cost. Point with id: %d doesn't exist.", p_to_id));
 
 	return from_point->pos.distance_to(to_point->pos);
 }
@@ -692,11 +692,11 @@ real_t AStar2D::_compute_cost(int p_from_id, int p_to_id) {
 Vector<Vector2> AStar2D::get_point_path(int p_from_id, int p_to_id) {
 	AStar::Point *a;
 	bool from_exists = astar.points.lookup(p_from_id, a);
-	ERR_FAIL_COND_V(!from_exists, Vector<Vector2>());
+	ERR_FAIL_COND_V_MSG(!from_exists, Vector<Vector2>(), vformat("Can't get point path. Point with id: %d doesn't exist.", p_from_id));
 
 	AStar::Point *b;
 	bool to_exists = astar.points.lookup(p_to_id, b);
-	ERR_FAIL_COND_V(!to_exists, Vector<Vector2>());
+	ERR_FAIL_COND_V_MSG(!to_exists, Vector<Vector2>(), vformat("Can't get point path. Point with id: %d doesn't exist.", p_to_id));
 
 	if (a == b) {
 		Vector<Vector2> ret;
@@ -741,11 +741,11 @@ Vector<Vector2> AStar2D::get_point_path(int p_from_id, int p_to_id) {
 Vector<int> AStar2D::get_id_path(int p_from_id, int p_to_id) {
 	AStar::Point *a;
 	bool from_exists = astar.points.lookup(p_from_id, a);
-	ERR_FAIL_COND_V(!from_exists, Vector<int>());
+	ERR_FAIL_COND_V_MSG(!from_exists, Vector<int>(), vformat("Can't get id path. Point with id: %d doesn't exist.", p_from_id));
 
 	AStar::Point *b;
 	bool to_exists = astar.points.lookup(p_to_id, b);
-	ERR_FAIL_COND_V(!to_exists, Vector<int>());
+	ERR_FAIL_COND_V_MSG(!to_exists, Vector<int>(), vformat("Can't get id path. Point with id: %d doesn't exist.", p_to_id));
 
 	if (a == b) {
 		Vector<int> ret;
diff --git a/core/math/basis.cpp b/core/math/basis.cpp
index eec9caf149..a7f89522d7 100644
--- a/core/math/basis.cpp
+++ b/core/math/basis.cpp
@@ -207,6 +207,10 @@ Basis Basis::transposed() const {
 	return tr;
 }
 
+Basis Basis::from_scale(const Vector3 &p_scale) {
+	return Basis(p_scale.x, 0, 0, 0, p_scale.y, 0, 0, 0, p_scale.z);
+}
+
 // Multiplies the matrix from left by the scaling matrix: M -> S.M
 // See the comment for Basis::rotated for further explanation.
 void Basis::scale(const Vector3 &p_scale) {
@@ -246,10 +250,7 @@ void Basis::make_scale_uniform() {
 }
 
 Basis Basis::scaled_local(const Vector3 &p_scale) const {
-	Basis b;
-	b.set_diagonal(p_scale);
-
-	return (*this) * b;
+	return (*this) * Basis::from_scale(p_scale);
 }
 
 Vector3 Basis::get_scale_abs() const {
@@ -991,21 +992,23 @@ void Basis::set_axis_angle(const Vector3 &p_axis, real_t p_phi) {
 }
 
 void Basis::set_axis_angle_scale(const Vector3 &p_axis, real_t p_phi, const Vector3 &p_scale) {
-	set_diagonal(p_scale);
+	_set_diagonal(p_scale);
 	rotate(p_axis, p_phi);
 }
 
 void Basis::set_euler_scale(const Vector3 &p_euler, const Vector3 &p_scale) {
-	set_diagonal(p_scale);
+	_set_diagonal(p_scale);
 	rotate(p_euler);
 }
 
 void Basis::set_quaternion_scale(const Quaternion &p_quaternion, const Vector3 &p_scale) {
-	set_diagonal(p_scale);
+	_set_diagonal(p_scale);
 	rotate(p_quaternion);
 }
 
-void Basis::set_diagonal(const Vector3 &p_diag) {
+// This also sets the non-diagonal elements to 0, which is misleading from the
+// name, so we want this method to be private. Use `from_scale` externally.
+void Basis::_set_diagonal(const Vector3 &p_diag) {
 	elements[0][0] = p_diag.x;
 	elements[0][1] = 0;
 	elements[0][2] = 0;
diff --git a/core/math/basis.h b/core/math/basis.h
index 9d8ed16e29..eb107d7e4e 100644
--- a/core/math/basis.h
+++ b/core/math/basis.h
@@ -35,6 +35,9 @@
 #include "core/math/vector3.h"
 
 class Basis {
+private:
+	void _set_diagonal(const Vector3 &p_diag);
+
 public:
 	Vector3 elements[3] = {
 		Vector3(1, 0, 0),
@@ -166,8 +169,6 @@ public:
 	int get_orthogonal_index() const;
 	void set_orthogonal_index(int p_index);
 
-	void set_diagonal(const Vector3 &p_diag);
-
 	bool is_orthogonal() const;
 	bool is_diagonal() const;
 	bool is_rotation() const;
@@ -254,6 +255,7 @@ public:
 
 	Basis(const Vector3 &p_axis, real_t p_phi) { set_axis_angle(p_axis, p_phi); }
 	Basis(const Vector3 &p_axis, real_t p_phi, const Vector3 &p_scale) { set_axis_angle_scale(p_axis, p_phi, p_scale); }
+	static Basis from_scale(const Vector3 &p_scale);
 
 	_FORCE_INLINE_ Basis(const Vector3 &row0, const Vector3 &row1, const Vector3 &row2) {
 		elements[0] = row0;
diff --git a/core/math/transform_2d.cpp b/core/math/transform_2d.cpp
index 16934d67df..060b619892 100644
--- a/core/math/transform_2d.cpp
+++ b/core/math/transform_2d.cpp
@@ -63,7 +63,7 @@ Transform2D Transform2D::affine_inverse() const {
 	return inv;
 }
 
-void Transform2D::rotate(real_t p_phi) {
+void Transform2D::rotate(const real_t p_phi) {
 	*this = Transform2D(p_phi, Vector2()) * (*this);
 }
 
@@ -72,7 +72,7 @@ real_t Transform2D::get_skew() const {
 	return Math::acos(elements[0].normalized().dot(SGN(det) * elements[1].normalized())) - Math_PI * 0.5;
 }
 
-void Transform2D::set_skew(float p_angle) {
+void Transform2D::set_skew(const real_t p_angle) {
 	real_t det = basis_determinant();
 	elements[1] = SGN(det) * elements[0].rotated((Math_PI * 0.5 + p_angle)).normalized() * elements[1].length();
 }
@@ -81,7 +81,7 @@ real_t Transform2D::get_rotation() const {
 	return Math::atan2(elements[0].y, elements[0].x);
 }
 
-void Transform2D::set_rotation(real_t p_rot) {
+void Transform2D::set_rotation(const real_t p_rot) {
 	Size2 scale = get_scale();
 	real_t cr = Math::cos(p_rot);
 	real_t sr = Math::sin(p_rot);
@@ -92,7 +92,7 @@ void Transform2D::set_rotation(real_t p_rot) {
 	set_scale(scale);
 }
 
-Transform2D::Transform2D(real_t p_rot, const Vector2 &p_pos) {
+Transform2D::Transform2D(const real_t p_rot, const Vector2 &p_pos) {
 	real_t cr = Math::cos(p_rot);
 	real_t sr = Math::sin(p_rot);
 	elements[0][0] = cr;
@@ -102,6 +102,14 @@ Transform2D::Transform2D(real_t p_rot, const Vector2 &p_pos) {
 	elements[2] = p_pos;
 }
 
+Transform2D::Transform2D(const real_t p_rot, const Size2 &p_scale, const real_t p_skew, const Vector2 &p_pos) {
+	elements[0][0] = Math::cos(p_rot) * p_scale.x;
+	elements[1][1] = Math::cos(p_rot + p_skew) * p_scale.y;
+	elements[1][0] = -Math::sin(p_rot + p_skew) * p_scale.y;
+	elements[0][1] = Math::sin(p_rot) * p_scale.x;
+	elements[2] = p_pos;
+}
+
 Size2 Transform2D::get_scale() const {
 	real_t det_sign = SGN(basis_determinant());
 	return Size2(elements[0].length(), det_sign * elements[1].length());
@@ -126,7 +134,7 @@ void Transform2D::scale_basis(const Size2 &p_scale) {
 	elements[1][1] *= p_scale.y;
 }
 
-void Transform2D::translate(real_t p_tx, real_t p_ty) {
+void Transform2D::translate(const real_t p_tx, const real_t p_ty) {
 	translate(Vector2(p_tx, p_ty));
 }
 
@@ -231,7 +239,7 @@ Transform2D Transform2D::translated(const Vector2 &p_offset) const {
 	return copy;
 }
 
-Transform2D Transform2D::rotated(real_t p_phi) const {
+Transform2D Transform2D::rotated(const real_t p_phi) const {
 	Transform2D copy = *this;
 	copy.rotate(p_phi);
 	return copy;
@@ -241,7 +249,7 @@ real_t Transform2D::basis_determinant() const {
 	return elements[0].x * elements[1].y - elements[0].y * elements[1].x;
 }
 
-Transform2D Transform2D::interpolate_with(const Transform2D &p_transform, real_t p_c) const {
+Transform2D Transform2D::interpolate_with(const Transform2D &p_transform, const real_t p_c) const {
 	//extract parameters
 	Vector2 p1 = get_origin();
 	Vector2 p2 = p_transform.get_origin();
diff --git a/core/math/transform_2d.h b/core/math/transform_2d.h
index 34cfd0c1a9..6ed3af2ba7 100644
--- a/core/math/transform_2d.h
+++ b/core/math/transform_2d.h
@@ -68,17 +68,17 @@ struct Transform2D {
 	void affine_invert();
 	Transform2D affine_inverse() const;
 
-	void set_rotation(real_t p_rot);
+	void set_rotation(const real_t p_rot);
 	real_t get_rotation() const;
 	real_t get_skew() const;
-	void set_skew(float p_angle);
-	_FORCE_INLINE_ void set_rotation_and_scale(real_t p_rot, const Size2 &p_scale);
-	_FORCE_INLINE_ void set_rotation_scale_and_skew(real_t p_rot, const Size2 &p_scale, float p_skew);
-	void rotate(real_t p_phi);
+	void set_skew(const real_t p_angle);
+	_FORCE_INLINE_ void set_rotation_and_scale(const real_t p_rot, const Size2 &p_scale);
+	_FORCE_INLINE_ void set_rotation_scale_and_skew(const real_t p_rot, const Size2 &p_scale, const real_t p_skew);
+	void rotate(const real_t p_phi);
 
 	void scale(const Size2 &p_scale);
 	void scale_basis(const Size2 &p_scale);
-	void translate(real_t p_tx, real_t p_ty);
+	void translate(const real_t p_tx, const real_t p_ty);
 	void translate(const Vector2 &p_translation);
 
 	real_t basis_determinant() const;
@@ -92,7 +92,7 @@ struct Transform2D {
 	Transform2D scaled(const Size2 &p_scale) const;
 	Transform2D basis_scaled(const Size2 &p_scale) const;
 	Transform2D translated(const Vector2 &p_offset) const;
-	Transform2D rotated(real_t p_phi) const;
+	Transform2D rotated(const real_t p_phi) const;
 
 	Transform2D untranslated() const;
 
@@ -110,7 +110,7 @@ struct Transform2D {
 	void operator*=(const real_t p_val);
 	Transform2D operator*(const real_t p_val) const;
 
-	Transform2D interpolate_with(const Transform2D &p_transform, real_t p_c) const;
+	Transform2D interpolate_with(const Transform2D &p_transform, const real_t p_c) const;
 
 	_FORCE_INLINE_ Vector2 basis_xform(const Vector2 &p_vec) const;
 	_FORCE_INLINE_ Vector2 basis_xform_inv(const Vector2 &p_vec) const;
@@ -123,7 +123,7 @@ struct Transform2D {
 
 	operator String() const;
 
-	Transform2D(real_t xx, real_t xy, real_t yx, real_t yy, real_t ox, real_t oy) {
+	Transform2D(const real_t xx, const real_t xy, const real_t yx, const real_t yy, const real_t ox, const real_t oy) {
 		elements[0][0] = xx;
 		elements[0][1] = xy;
 		elements[1][0] = yx;
@@ -138,7 +138,10 @@ struct Transform2D {
 		elements[2] = p_origin;
 	}
 
-	Transform2D(real_t p_rot, const Vector2 &p_pos);
+	Transform2D(const real_t p_rot, const Vector2 &p_pos);
+
+	Transform2D(const real_t p_rot, const Size2 &p_scale, const real_t p_skew, const Vector2 &p_pos);
+
 	Transform2D() {
 		elements[0][0] = 1.0;
 		elements[1][1] = 1.0;
@@ -185,14 +188,14 @@ Rect2 Transform2D::xform(const Rect2 &p_rect) const {
 	return new_rect;
 }
 
-void Transform2D::set_rotation_and_scale(real_t p_rot, const Size2 &p_scale) {
+void Transform2D::set_rotation_and_scale(const real_t p_rot, const Size2 &p_scale) {
 	elements[0][0] = Math::cos(p_rot) * p_scale.x;
 	elements[1][1] = Math::cos(p_rot) * p_scale.y;
 	elements[1][0] = -Math::sin(p_rot) * p_scale.y;
 	elements[0][1] = Math::sin(p_rot) * p_scale.x;
 }
 
-void Transform2D::set_rotation_scale_and_skew(real_t p_rot, const Size2 &p_scale, float p_skew) {
+void Transform2D::set_rotation_scale_and_skew(const real_t p_rot, const Size2 &p_scale, const real_t p_skew) {
 	elements[0][0] = Math::cos(p_rot) * p_scale.x;
 	elements[1][1] = Math::cos(p_rot + p_skew) * p_scale.y;
 	elements[1][0] = -Math::sin(p_rot + p_skew) * p_scale.y;
diff --git a/core/math/vector3.cpp b/core/math/vector3.cpp
index 401c3ccd9c..fa212c178a 100644
--- a/core/math/vector3.cpp
+++ b/core/math/vector3.cpp
@@ -115,12 +115,6 @@ Basis Vector3::outer(const Vector3 &p_b) const {
 	return Basis(row0, row1, row2);
 }
 
-Basis Vector3::to_diagonal_matrix() const {
-	return Basis(x, 0, 0,
-			0, y, 0,
-			0, 0, z);
-}
-
 bool Vector3::is_equal_approx(const Vector3 &p_v) const {
 	return Math::is_equal_approx(x, p_v.x) && Math::is_equal_approx(y, p_v.y) && Math::is_equal_approx(z, p_v.z);
 }
diff --git a/core/math/vector3.h b/core/math/vector3.h
index 6a4c42f41b..e65ac31c02 100644
--- a/core/math/vector3.h
+++ b/core/math/vector3.h
@@ -106,7 +106,6 @@ struct Vector3 {
 	_FORCE_INLINE_ Vector3 cross(const Vector3 &p_b) const;
 	_FORCE_INLINE_ real_t dot(const Vector3 &p_b) const;
 	Basis outer(const Vector3 &p_b) const;
-	Basis to_diagonal_matrix() const;
 
 	_FORCE_INLINE_ Vector3 abs() const;
 	_FORCE_INLINE_ Vector3 floor() const;
diff --git a/core/os/os.cpp b/core/os/os.cpp
index dc3fe29dca..7505f3ff34 100644
--- a/core/os/os.cpp
+++ b/core/os/os.cpp
@@ -231,6 +231,12 @@ String OS::get_locale() const {
 	return "en";
 }
 
+// Non-virtual helper to extract the 2 or 3-letter language code from
+// `get_locale()` in a way that's consistent for all platforms.
+String OS::get_locale_language() const {
+	return get_locale().left(3).replace("_", "");
+}
+
 // Helper function to ensure that a dir name/path will be valid on the OS
 String OS::get_safe_dir_name(const String &p_dir_name, bool p_allow_dir_separator) const {
 	Vector<String> invalid_chars = String(": * ? \" < > |").split(" ");
diff --git a/core/os/os.h b/core/os/os.h
index f585483300..c027428477 100644
--- a/core/os/os.h
+++ b/core/os/os.h
@@ -243,6 +243,7 @@ public:
 	RenderThreadMode get_render_thread_mode() const { return _render_thread_mode; }
 
 	virtual String get_locale() const;
+	String get_locale_language() const;
 
 	String get_safe_dir_name(const String &p_dir_name, bool p_allow_dir_separator = false) const;
 	virtual String get_godot_dir_name() const;
diff --git a/core/os/thread.cpp b/core/os/thread.cpp
index 73e31bdb3d..92e43963d2 100644
--- a/core/os/thread.cpp
+++ b/core/os/thread.cpp
@@ -28,6 +28,10 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+// Define PLATFORM_CUSTOM_THREAD_H in platform_config.h
+// Overriding the platform implementation is required in some proprietary platforms
+#ifndef PLATFORM_CUSTOM_THREAD_H
+
 #include "thread.h"
 
 #include "core/object/script_language.h"
@@ -126,3 +130,4 @@ Thread::~Thread() {
 }
 
 #endif
+#endif // PLATFORM_CUSTOM_THREAD_H
diff --git a/core/os/thread.h b/core/os/thread.h
index 17ac82c650..3a0938c7f7 100644
--- a/core/os/thread.h
+++ b/core/os/thread.h
@@ -28,6 +28,11 @@
 /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
 /*************************************************************************/
 
+// Define PLATFORM_CUSTOM_THREAD_H in platform_config.h
+// Overriding the platform implementation is required in some proprietary platforms
+#ifdef PLATFORM_CUSTOM_THREAD_H
+#include PLATFORM_CUSTOM_THREAD_H
+#else
 #ifndef THREAD_H
 #define THREAD_H
 
@@ -116,3 +121,4 @@ public:
 };
 
 #endif // THREAD_H
+#endif // PLATFORM_CUSTOM_THREAD_H
diff --git a/core/string/ustring.cpp b/core/string/ustring.cpp
index 8416ff929e..daeb7fbd17 100644
--- a/core/string/ustring.cpp
+++ b/core/string/ustring.cpp
@@ -1551,19 +1551,21 @@ String String::num_real(double p_num, bool p_trailing) {
 
 	bool neg = p_num < 0;
 	p_num = ABS(p_num);
-	int intn = (int)p_num;
+	int64_t intn = (int64_t)p_num;
 
 	// Decimal part.
 
 	if (intn != p_num) {
-		double dec = p_num - (double)(intn);
+		double dec = p_num - (double)intn;
 
 		int digit = 0;
 
-#if REAL_T_IS_DOUBLE
+#ifdef REAL_T_IS_DOUBLE
 		int decimals = 14;
+		double tolerance = 1e-14;
 #else
 		int decimals = 6;
+		double tolerance = 1e-6;
 #endif
 		// We want to align the digits to the above sane default, so we only
 		// need to subtract log10 for numbers with a positive power of ten.
@@ -1575,16 +1577,21 @@ String String::num_real(double p_num, bool p_trailing) {
 			decimals = MAX_DECIMALS;
 		}
 
-		int dec_int = 0;
-		int dec_max = 0;
+		// In case the value ends up ending in "99999", we want to add a
+		// tiny bit to the value we're checking when deciding when to stop,
+		// so we multiply by slightly above 1 (1 + 1e-7 or 1e-15).
+		double check_multiplier = 1 + tolerance / 10;
+
+		int64_t dec_int = 0;
+		int64_t dec_max = 0;
 
 		while (true) {
 			dec *= 10.0;
-			dec_int = dec_int * 10 + (int)dec % 10;
+			dec_int = dec_int * 10 + (int64_t)dec % 10;
 			dec_max = dec_max * 10 + 9;
 			digit++;
 
-			if ((dec - (double)((int)dec)) < 1e-6) {
+			if ((dec - (double)(int64_t)(dec * check_multiplier)) < tolerance) {
 				break;
 			}
 
@@ -1594,7 +1601,7 @@ String String::num_real(double p_num, bool p_trailing) {
 		}
 
 		dec *= 10;
-		int last = (int)dec % 10;
+		int last = (int64_t)dec % 10;
 
 		if (last > 5) {
 			if (dec_int == dec_max) {
@@ -3555,7 +3562,7 @@ String String::strip_edges(bool left, bool right) const {
 	}
 
 	if (right) {
-		for (int i = (int)(len - 1); i >= 0; i--) {
+		for (int i = len - 1; i >= 0; i--) {
 			if (operator[](i) <= 32) {
 				end--;
 			} else {
diff --git a/core/variant/variant_call.cpp b/core/variant/variant_call.cpp
index 39207df9e7..4a7d6761d8 100644
--- a/core/variant/variant_call.cpp
+++ b/core/variant/variant_call.cpp
@@ -1568,7 +1568,6 @@ static void _register_variant_builtin_methods() {
 	bind_method(Vector3, dot, sarray("with"), varray());
 	bind_method(Vector3, cross, sarray("with"), varray());
 	bind_method(Vector3, outer, sarray("with"), varray());
-	bind_method(Vector3, to_diagonal_matrix, sarray(), varray());
 	bind_method(Vector3, abs, sarray(), varray());
 	bind_method(Vector3, floor, sarray(), varray());
 	bind_method(Vector3, ceil, sarray(), varray());
@@ -1703,6 +1702,7 @@ static void _register_variant_builtin_methods() {
 	bind_method(Transform2D, get_rotation, sarray(), varray());
 	bind_method(Transform2D, get_origin, sarray(), varray());
 	bind_method(Transform2D, get_scale, sarray(), varray());
+	bind_method(Transform2D, get_skew, sarray(), varray());
 	bind_method(Transform2D, orthonormalized, sarray(), varray());
 	bind_method(Transform2D, rotated, sarray("phi"), varray());
 	bind_method(Transform2D, scaled, sarray("scale"), varray());
@@ -1712,6 +1712,8 @@ static void _register_variant_builtin_methods() {
 	bind_method(Transform2D, interpolate_with, sarray("xform", "weight"), varray());
 	bind_method(Transform2D, is_equal_approx, sarray("xform"), varray());
 	bind_method(Transform2D, set_rotation, sarray("rotation"), varray());
+	bind_method(Transform2D, set_scale, sarray("scale"), varray());
+	bind_method(Transform2D, set_skew, sarray("skew"), varray());
 	bind_method(Transform2D, looking_at, sarray("target"), varray(Vector2()));
 
 	/* Basis */
@@ -1732,6 +1734,7 @@ static void _register_variant_builtin_methods() {
 	bind_method(Basis, is_equal_approx, sarray("b"), varray());
 	bind_method(Basis, get_rotation_quaternion, sarray(), varray());
 	bind_static_method(Basis, looking_at, sarray("target", "up"), varray(Vector3(0, 1, 0)));
+	bind_static_method(Basis, from_scale, sarray("scale"), varray());
 
 	/* AABB */
 
diff --git a/core/variant/variant_construct.cpp b/core/variant/variant_construct.cpp
index a1a2bec369..4317b9dc98 100644
--- a/core/variant/variant_construct.cpp
+++ b/core/variant/variant_construct.cpp
@@ -114,6 +114,7 @@ void Variant::_register_variant_constructors() {
 	add_constructor<VariantConstructNoArgs<Transform2D>>(sarray());
 	add_constructor<VariantConstructor<Transform2D, Transform2D>>(sarray("from"));
 	add_constructor<VariantConstructor<Transform2D, float, Vector2>>(sarray("rotation", "position"));
+	add_constructor<VariantConstructor<Transform2D, float, Size2, float, Vector2>>(sarray("rotation", "scale", "skew", "position"));
 	add_constructor<VariantConstructor<Transform2D, Vector2, Vector2, Vector2>>(sarray("x_axis", "y_axis", "origin"));
 
 	add_constructor<VariantConstructNoArgs<Plane>>(sarray());
diff --git a/core/variant/variant_op.cpp b/core/variant/variant_op.cpp
index a245aff35b..b94588f480 100644
--- a/core/variant/variant_op.cpp
+++ b/core/variant/variant_op.cpp
@@ -314,6 +314,74 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorEqual<PackedVector3Array, PackedVector3Array>>(Variant::OP_EQUAL, Variant::PACKED_VECTOR3_ARRAY, Variant::PACKED_VECTOR3_ARRAY);
 	register_op<OperatorEvaluatorEqual<PackedColorArray, PackedColorArray>>(Variant::OP_EQUAL, Variant::PACKED_COLOR_ARRAY, Variant::PACKED_COLOR_ARRAY);
 
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::BOOL, Variant::NIL>>(Variant::OP_EQUAL, Variant::BOOL, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::INT, Variant::NIL>>(Variant::OP_EQUAL, Variant::INT, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::FLOAT, Variant::NIL>>(Variant::OP_EQUAL, Variant::FLOAT, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::STRING, Variant::NIL>>(Variant::OP_EQUAL, Variant::STRING, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::VECTOR2, Variant::NIL>>(Variant::OP_EQUAL, Variant::VECTOR2, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::VECTOR2I, Variant::NIL>>(Variant::OP_EQUAL, Variant::VECTOR2I, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::RECT2, Variant::NIL>>(Variant::OP_EQUAL, Variant::RECT2, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::RECT2I, Variant::NIL>>(Variant::OP_EQUAL, Variant::RECT2I, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::VECTOR3, Variant::NIL>>(Variant::OP_EQUAL, Variant::VECTOR3, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::VECTOR3I, Variant::NIL>>(Variant::OP_EQUAL, Variant::VECTOR3I, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::TRANSFORM2D, Variant::NIL>>(Variant::OP_EQUAL, Variant::TRANSFORM2D, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PLANE, Variant::NIL>>(Variant::OP_EQUAL, Variant::PLANE, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::QUATERNION, Variant::NIL>>(Variant::OP_EQUAL, Variant::QUATERNION, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::AABB, Variant::NIL>>(Variant::OP_EQUAL, Variant::AABB, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::BASIS, Variant::NIL>>(Variant::OP_EQUAL, Variant::BASIS, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::TRANSFORM3D, Variant::NIL>>(Variant::OP_EQUAL, Variant::TRANSFORM3D, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::COLOR, Variant::NIL>>(Variant::OP_EQUAL, Variant::COLOR, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::STRING_NAME, Variant::NIL>>(Variant::OP_EQUAL, Variant::STRING_NAME, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NODE_PATH, Variant::NIL>>(Variant::OP_EQUAL, Variant::NODE_PATH, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::RID, Variant::NIL>>(Variant::OP_EQUAL, Variant::RID, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::CALLABLE, Variant::NIL>>(Variant::OP_EQUAL, Variant::CALLABLE, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::SIGNAL, Variant::NIL>>(Variant::OP_EQUAL, Variant::SIGNAL, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::DICTIONARY, Variant::NIL>>(Variant::OP_EQUAL, Variant::DICTIONARY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_BYTE_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_BYTE_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_INT32_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_INT32_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_INT64_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_INT64_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_FLOAT32_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_FLOAT32_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_FLOAT64_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_FLOAT64_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_STRING_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_STRING_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_VECTOR2_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_VECTOR2_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_VECTOR3_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_VECTOR3_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::PACKED_COLOR_ARRAY, Variant::NIL>>(Variant::OP_EQUAL, Variant::PACKED_COLOR_ARRAY, Variant::NIL);
+
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::BOOL>>(Variant::OP_EQUAL, Variant::NIL, Variant::BOOL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::INT>>(Variant::OP_EQUAL, Variant::NIL, Variant::INT);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::FLOAT>>(Variant::OP_EQUAL, Variant::NIL, Variant::FLOAT);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::STRING>>(Variant::OP_EQUAL, Variant::NIL, Variant::STRING);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::VECTOR2>>(Variant::OP_EQUAL, Variant::NIL, Variant::VECTOR2);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::VECTOR2I>>(Variant::OP_EQUAL, Variant::NIL, Variant::VECTOR2I);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::RECT2>>(Variant::OP_EQUAL, Variant::NIL, Variant::RECT2);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::RECT2I>>(Variant::OP_EQUAL, Variant::NIL, Variant::RECT2I);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::VECTOR3>>(Variant::OP_EQUAL, Variant::NIL, Variant::VECTOR3);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::VECTOR3I>>(Variant::OP_EQUAL, Variant::NIL, Variant::VECTOR3I);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::TRANSFORM2D>>(Variant::OP_EQUAL, Variant::NIL, Variant::TRANSFORM2D);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PLANE>>(Variant::OP_EQUAL, Variant::NIL, Variant::PLANE);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::QUATERNION>>(Variant::OP_EQUAL, Variant::NIL, Variant::QUATERNION);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::AABB>>(Variant::OP_EQUAL, Variant::NIL, Variant::AABB);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::BASIS>>(Variant::OP_EQUAL, Variant::NIL, Variant::BASIS);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::TRANSFORM3D>>(Variant::OP_EQUAL, Variant::NIL, Variant::TRANSFORM3D);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::COLOR>>(Variant::OP_EQUAL, Variant::NIL, Variant::COLOR);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::STRING_NAME>>(Variant::OP_EQUAL, Variant::NIL, Variant::STRING_NAME);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::NODE_PATH>>(Variant::OP_EQUAL, Variant::NIL, Variant::NODE_PATH);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::RID>>(Variant::OP_EQUAL, Variant::NIL, Variant::RID);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::CALLABLE>>(Variant::OP_EQUAL, Variant::NIL, Variant::CALLABLE);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::SIGNAL>>(Variant::OP_EQUAL, Variant::NIL, Variant::SIGNAL);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::DICTIONARY>>(Variant::OP_EQUAL, Variant::NIL, Variant::DICTIONARY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_BYTE_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_BYTE_ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_INT32_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_INT32_ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_INT64_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_INT64_ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_FLOAT32_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_FLOAT32_ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_FLOAT64_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_FLOAT64_ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_STRING_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_STRING_ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_VECTOR2_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_VECTOR2_ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_VECTOR3_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_VECTOR3_ARRAY);
+	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_COLOR_ARRAY>>(Variant::OP_EQUAL, Variant::NIL, Variant::PACKED_COLOR_ARRAY);
+
 	register_op<OperatorEvaluatorAlwaysFalse<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::NIL);
 	register_op<OperatorEvaluatorNotEqual<bool, bool>>(Variant::OP_NOT_EQUAL, Variant::BOOL, Variant::BOOL);
 	register_op<OperatorEvaluatorNotEqual<int64_t, int64_t>>(Variant::OP_NOT_EQUAL, Variant::INT, Variant::INT);
@@ -360,6 +428,74 @@ void Variant::_register_variant_operators() {
 	register_op<OperatorEvaluatorNotEqual<PackedVector3Array, PackedVector3Array>>(Variant::OP_NOT_EQUAL, Variant::PACKED_VECTOR3_ARRAY, Variant::PACKED_VECTOR3_ARRAY);
 	register_op<OperatorEvaluatorNotEqual<PackedColorArray, PackedColorArray>>(Variant::OP_NOT_EQUAL, Variant::PACKED_COLOR_ARRAY, Variant::PACKED_COLOR_ARRAY);
 
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::BOOL, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::BOOL, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::INT, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::INT, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::FLOAT, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::FLOAT, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::STRING, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::STRING, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::VECTOR2, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::VECTOR2, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::VECTOR2I, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::VECTOR2I, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::RECT2, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::RECT2, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::RECT2I, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::RECT2I, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::VECTOR3, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::VECTOR3, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::VECTOR3I, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::VECTOR3I, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::TRANSFORM2D, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::TRANSFORM2D, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PLANE, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PLANE, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::QUATERNION, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::QUATERNION, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::AABB, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::AABB, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::BASIS, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::BASIS, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::TRANSFORM3D, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::TRANSFORM3D, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::COLOR, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::COLOR, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::STRING_NAME, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::STRING_NAME, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NODE_PATH, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::NODE_PATH, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::RID, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::RID, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::CALLABLE, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::CALLABLE, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::SIGNAL, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::SIGNAL, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::DICTIONARY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::DICTIONARY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_BYTE_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_BYTE_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_INT32_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_INT32_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_INT64_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_INT64_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_FLOAT32_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_FLOAT32_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_FLOAT64_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_FLOAT64_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_STRING_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_STRING_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_VECTOR2_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_VECTOR2_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_VECTOR3_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_VECTOR3_ARRAY, Variant::NIL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::PACKED_COLOR_ARRAY, Variant::NIL>>(Variant::OP_NOT_EQUAL, Variant::PACKED_COLOR_ARRAY, Variant::NIL);
+
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::BOOL>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::BOOL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::INT>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::INT);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::FLOAT>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::FLOAT);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::STRING>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::STRING);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::VECTOR2>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::VECTOR2);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::VECTOR2I>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::VECTOR2I);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::RECT2>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::RECT2);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::RECT2I>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::RECT2I);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::VECTOR3>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::VECTOR3);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::VECTOR3I>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::VECTOR3I);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::TRANSFORM2D>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::TRANSFORM2D);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PLANE>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PLANE);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::QUATERNION>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::QUATERNION);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::AABB>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::AABB);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::BASIS>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::BASIS);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::TRANSFORM3D>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::TRANSFORM3D);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::COLOR>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::COLOR);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::STRING_NAME>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::STRING_NAME);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::NODE_PATH>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::NODE_PATH);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::RID>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::RID);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::CALLABLE>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::CALLABLE);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::SIGNAL>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::SIGNAL);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::DICTIONARY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::DICTIONARY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_BYTE_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_BYTE_ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_INT32_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_INT32_ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_INT64_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_INT64_ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_FLOAT32_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_FLOAT32_ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_FLOAT64_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_FLOAT64_ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_STRING_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_STRING_ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_VECTOR2_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_VECTOR2_ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_VECTOR3_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_VECTOR3_ARRAY);
+	register_op<OperatorEvaluatorAlwaysTrue<Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_COLOR_ARRAY>>(Variant::OP_NOT_EQUAL, Variant::NIL, Variant::PACKED_COLOR_ARRAY);
+
 	register_op<OperatorEvaluatorLess<bool, bool>>(Variant::OP_LESS, Variant::BOOL, Variant::BOOL);
 	register_op<OperatorEvaluatorLess<int64_t, int64_t>>(Variant::OP_LESS, Variant::INT, Variant::INT);
 	register_op<OperatorEvaluatorLess<int64_t, double>>(Variant::OP_LESS, Variant::INT, Variant::FLOAT);
diff --git a/core/variant/variant_setget.cpp b/core/variant/variant_setget.cpp
index ae3c7685fd..3bba68d75e 100644
--- a/core/variant/variant_setget.cpp
+++ b/core/variant/variant_setget.cpp
@@ -661,6 +661,91 @@ struct VariantIndexedSetGet_Array {
 	static uint64_t get_indexed_size(const Variant *base) { return 0; }
 };
 
+struct VariantIndexedSetGet_String {
+	static void get(const Variant *base, int64_t index, Variant *value, bool *oob) {
+		int64_t length = VariantGetInternalPtr<String>::get_ptr(base)->length();
+		if (index < 0) {
+			index += length;
+		}
+		if (index < 0 || index >= length) {
+			*oob = true;
+			return;
+		}
+		char32_t result = (*VariantGetInternalPtr<String>::get_ptr(base))[index];
+		*value = String(&result, 1);
+		*oob = false;
+	}
+	static void ptr_get(const void *base, int64_t index, void *member) {
+		/* avoid ptrconvert for performance*/
+		const String &v = *reinterpret_cast<const String *>(base);
+		if (index < 0) {
+			index += v.length();
+		}
+		OOB_TEST(index, v.length());
+		char32_t c = v[index];
+		PtrToArg<String>::encode(String(&c, 1), member);
+	}
+	static void set(Variant *base, int64_t index, const Variant *value, bool *valid, bool *oob) {
+		if (value->get_type() != Variant::STRING) {
+			*oob = false;
+			*valid = false;
+			return;
+		}
+		int64_t length = VariantGetInternalPtr<String>::get_ptr(base)->length();
+		if (index < 0) {
+			index += length;
+		}
+		if (index < 0 || index >= length) {
+			*oob = true;
+			*valid = false;
+			return;
+		}
+		String *b = VariantGetInternalPtr<String>::get_ptr(base);
+		const String *v = VariantInternal::get_string(value);
+		if (v->length() == 0) {
+			b->remove(index);
+		} else {
+			b->set(index, v->get(0));
+		}
+		*oob = false;
+		*valid = true;
+	}
+	static void validated_set(Variant *base, int64_t index, const Variant *value, bool *oob) {
+		int64_t length = VariantGetInternalPtr<String>::get_ptr(base)->length();
+		if (index < 0) {
+			index += length;
+		}
+		if (index < 0 || index >= length) {
+			*oob = true;
+			return;
+		}
+		String *b = VariantGetInternalPtr<String>::get_ptr(base);
+		const String *v = VariantInternal::get_string(value);
+		if (v->length() == 0) {
+			b->remove(index);
+		} else {
+			b->set(index, v->get(0));
+		}
+		*oob = false;
+	}
+	static void ptr_set(void *base, int64_t index, const void *member) {
+		/* avoid ptrconvert for performance*/
+		String &v = *reinterpret_cast<String *>(base);
+		if (index < 0) {
+			index += v.length();
+		}
+		OOB_TEST(index, v.length());
+		const String &m = *reinterpret_cast<const String *>(member);
+		if (unlikely(m.length() == 0)) {
+			v.remove(index);
+		} else {
+			v.set(index, m.unicode_at(0));
+		}
+	}
+	static Variant::Type get_index_type() { return Variant::STRING; }
+	static uint64_t get_indexed_size(const Variant *base) { return VariantInternal::get_string(base)->length(); }
+};
+
 #define INDEXED_SETGET_STRUCT_DICT(m_base_type)                                                                                     \
 	struct VariantIndexedSetGet_##m_base_type {                                                                                     \
 		static void get(const Variant *base, int64_t index, Variant *value, bool *oob) {                                            \
@@ -758,6 +843,7 @@ static void register_indexed_member(Variant::Type p_type) {
 void register_indexed_setters_getters() {
 #define REGISTER_INDEXED_MEMBER(m_base_type) register_indexed_member<VariantIndexedSetGet_##m_base_type>(GetTypeInfo<m_base_type>::VARIANT_TYPE)
 
+	REGISTER_INDEXED_MEMBER(String);
 	REGISTER_INDEXED_MEMBER(Vector2);
 	REGISTER_INDEXED_MEMBER(Vector2i);
 	REGISTER_INDEXED_MEMBER(Vector3);