Ensure cyclic dependencies between scripts are broken at exit

modules/gdscript/gdscript.cpp

@@ -2244,6 +2244,22 @@ GDScriptLanguage::~GDScriptLanguage() {
 	if (_call_stack) {
 		memdelete_arr(_call_stack);
 	}
+
+	// Clear dependencies between scripts, to ensure cyclic references are broken (to avoid leaks at exit).
+	while (script_list.first()) {
+		GDScript *script = script_list.first()->self();
+		for (Map<StringName, GDScriptFunction *>::Element *E = script->member_functions.front(); E; E = E->next()) {
+			GDScriptFunction *func = E->get();
+			for (int i = 0; i < func->argument_types.size(); i++) {
+				func->argument_types.write[i].script_type_ref = Ref<Script>();
+			}
+			func->return_type.script_type_ref = Ref<Script>();
+		}
+		for (Map<StringName, GDScript::MemberInfo>::Element *E = script->member_indices.front(); E; E = E->next()) {
+			E->get().data_type.script_type_ref = Ref<Script>();
+		}
+	}
+
 	singleton = NULL;
 }