Auto-release static GDTypes at exit.

This fixes "unclaimed StringName" warnings and improves engine shutdown correctness.

core/object/class_db.cpp

@@ -2420,6 +2420,7 @@ void ClassDB::cleanup_defaults() {
 	default_values_cached.clear();
 }
 
+LocalVector<GDType **> ClassDB::gdtype_autorelease_pool;
 void ClassDB::cleanup() {
 	//OBJTYPE_LOCK; hah not here
 
@@ -2440,6 +2441,15 @@ void ClassDB::cleanup() {
 	resource_base_extensions.clear();
 	compat_classes.clear();
 	native_structs.clear();
+
+	for (GDType **type : gdtype_autorelease_pool) {
+		if (!type) {
+			WARN_PRINT("GDType in autorelease pool was cleaned up before being auto-released. Ignoring.");
+		}
+		memdelete(*type);
+		*type = nullptr;
+	}
+	gdtype_autorelease_pool.clear();
 }
 
 // Array to use in optional parameters on methods and the DEFVAL_ARRAY macro.

core/object/class_db.h

@@ -234,6 +234,10 @@ public:
 	static Array default_array_arg;
 	static bool is_default_array_arg(const Array &p_array);
 
+	// Types added here will be automatically cleaned up on engine shutdown.
+	// Only add types that aren't cleaned up in another way.
+	static LocalVector<GDType **> gdtype_autorelease_pool;
+
 private:
 	// Non-locking variants of get_parent_class and is_parent_class.
 	static StringName _get_parent_class(const StringName &p_class);

core/object/object.cpp

@@ -2383,8 +2383,10 @@ void Object::assign_type_static(GDType **type_ptr, const char *p_name, const GDT
 		// Assigned while we were waiting.
 		return;
 	}
-	type = memnew(GDType(super_type, StringName(p_name, true)));
+	type = memnew(GDType(super_type, StringName(p_name)));
 	*type_ptr = type;
+
+	ClassDB::gdtype_autorelease_pool.push_back(type_ptr);
 }
 
 Object::~Object() {