diff --git a/gdextension/gdextension_interface.h b/gdextension/gdextension_interface.h
index 9f5ef728..8268afc3 100644
--- a/gdextension/gdextension_interface.h
+++ b/gdextension/gdextension_interface.h
@@ -198,6 +198,7 @@ typedef struct {
 
 typedef void (*GDExtensionVariantFromTypeConstructorFunc)(GDExtensionUninitializedVariantPtr, GDExtensionTypePtr);
 typedef void (*GDExtensionTypeFromVariantConstructorFunc)(GDExtensionUninitializedTypePtr, GDExtensionVariantPtr);
+typedef void *(*GDExtensionVariantGetInternalPtrFunc)(GDExtensionVariantPtr);
 typedef void (*GDExtensionPtrOperatorEvaluator)(GDExtensionConstTypePtr p_left, GDExtensionConstTypePtr p_right, GDExtensionTypePtr r_result);
 typedef void (*GDExtensionPtrBuiltInMethod)(GDExtensionTypePtr p_base, const GDExtensionConstTypePtr *p_args, GDExtensionTypePtr r_return, int p_argument_count);
 typedef void (*GDExtensionPtrConstructor)(GDExtensionUninitializedTypePtr p_base, const GDExtensionConstTypePtr *p_args);
@@ -420,7 +421,9 @@ typedef enum {
 	GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_UINT32,
 	GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_UINT64,
 	GDEXTENSION_METHOD_ARGUMENT_METADATA_REAL_IS_FLOAT,
-	GDEXTENSION_METHOD_ARGUMENT_METADATA_REAL_IS_DOUBLE
+	GDEXTENSION_METHOD_ARGUMENT_METADATA_REAL_IS_DOUBLE,
+	GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_CHAR16,
+	GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_CHAR32,
 } GDExtensionClassMethodArgumentMetadata;
 
 typedef void (*GDExtensionClassMethodCall)(void *method_userdata, GDExtensionClassInstancePtr p_instance, const GDExtensionConstVariantPtr *p_args, GDExtensionInt p_argument_count, GDExtensionVariantPtr r_return, GDExtensionCallError *r_error);
@@ -1311,6 +1314,9 @@ typedef GDExtensionBool (*GDExtensionInterfaceVariantHasKey)(GDExtensionConstVar
  *
  * Gets the object instance ID from a variant of type GDEXTENSION_VARIANT_TYPE_OBJECT.
  *
+ * If the variant isn't of type GDEXTENSION_VARIANT_TYPE_OBJECT, then zero will be returned.
+ * The instance ID will be returned even if the object is no longer valid - use `object_get_instance_by_id()` to check if the object is still valid.
+ *
  * @param p_self A pointer to the Variant.
  *
  * @return The instance ID for the contained object.
@@ -1378,6 +1384,23 @@ typedef GDExtensionVariantFromTypeConstructorFunc (*GDExtensionInterfaceGetVaria
  */
 typedef GDExtensionTypeFromVariantConstructorFunc (*GDExtensionInterfaceGetVariantToTypeConstructor)(GDExtensionVariantType p_type);
 
+/**
+ * @name variant_get_ptr_internal_getter
+ * @since 4.4
+ *
+ * Provides a function pointer for retrieving a pointer to a variant's internal value.
+ * Access to a variant's internal value can be used to modify it in-place, or to retrieve its value without the overhead of variant conversion functions.
+ * It is recommended to cache the getter for all variant types in a function table to avoid retrieval overhead upon use.
+ *
+ * @note Each function assumes the variant's type has already been determined and matches the function.
+ * Invoking the function with a variant of a mismatched type has undefined behavior, and may lead to a segmentation fault.
+ *
+ * @param p_type The Variant type.
+ *
+ * @return A pointer to a type-specific function that returns a pointer to the internal value of a variant. Check the implementation of this function (gdextension_variant_get_ptr_internal_getter) for pointee type info of each variant type.
+ */
+typedef GDExtensionVariantGetInternalPtrFunc (*GDExtensionInterfaceGetVariantGetInternalPtrFunc)(GDExtensionVariantType p_type);
+
 /**
  * @name variant_get_ptr_operator_evaluator
  * @since 4.1
diff --git a/include/godot_cpp/core/type_info.hpp b/include/godot_cpp/core/type_info.hpp
index d847598a..ebdad7b2 100644
--- a/include/godot_cpp/core/type_info.hpp
+++ b/include/godot_cpp/core/type_info.hpp
@@ -149,8 +149,8 @@ MAKE_TYPE_INFO_WITH_META(uint32_t, GDEXTENSION_VARIANT_TYPE_INT, GDEXTENSION_MET
 MAKE_TYPE_INFO_WITH_META(int32_t, GDEXTENSION_VARIANT_TYPE_INT, GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_INT32)
 MAKE_TYPE_INFO_WITH_META(uint64_t, GDEXTENSION_VARIANT_TYPE_INT, GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_UINT64)
 MAKE_TYPE_INFO_WITH_META(int64_t, GDEXTENSION_VARIANT_TYPE_INT, GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_INT64)
-MAKE_TYPE_INFO(char16_t, GDEXTENSION_VARIANT_TYPE_INT)
-MAKE_TYPE_INFO(char32_t, GDEXTENSION_VARIANT_TYPE_INT)
+MAKE_TYPE_INFO_WITH_META(char16_t, GDEXTENSION_VARIANT_TYPE_INT, GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_CHAR16)
+MAKE_TYPE_INFO_WITH_META(char32_t, GDEXTENSION_VARIANT_TYPE_INT, GDEXTENSION_METHOD_ARGUMENT_METADATA_INT_IS_CHAR32)
 MAKE_TYPE_INFO_WITH_META(float, GDEXTENSION_VARIANT_TYPE_FLOAT, GDEXTENSION_METHOD_ARGUMENT_METADATA_REAL_IS_FLOAT)
 MAKE_TYPE_INFO_WITH_META(double, GDEXTENSION_VARIANT_TYPE_FLOAT, GDEXTENSION_METHOD_ARGUMENT_METADATA_REAL_IS_DOUBLE)