GDScript: Fix type detection on Object typed assign

Also make typed assigns a debug-only thing, so release builds are more
lenient on errors.

modules/gdscript/gdscript_function.cpp

@@ -742,6 +742,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 
 				GD_ERR_BREAK(var_type < 0 || var_type >= Variant::VARIANT_MAX);
 
+#ifdef DEBUG_ENABLED
 				if (src->get_type() != var_type) {
 					if (Variant::can_convert_strict(src->get_type(), var_type)) {
 						Variant::CallError ce;
@@ -752,8 +753,11 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 						OPCODE_BREAK;
 					}
 				} else {
+#endif // DEBUG_ENABLED
 					*dst = *src;
+#ifdef DEBUG_ENABLED
 				}
+#endif // DEBUG_ENABLED
 
 				ip += 4;
 			}
@@ -766,17 +770,22 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 				GET_VARIANT_PTR(dst, 2);
 				GET_VARIANT_PTR(src, 3);
 
+#ifdef DEBUG_ENABLED
 				GDScriptNativeClass *nc = Object::cast_to<GDScriptNativeClass>(type->operator Object *());
 				GD_ERR_BREAK(!nc);
+				if (!src->get_type() != Variant::OBJECT && !src->get_type() != Variant::NIL) {
+					err_text = "Trying to assign value of type '" + Variant::get_type_name(src->get_type()) +
+							   "' to a variable of type '" + nc->get_name() + "'.";
+					OPCODE_BREAK;
+				}
 				Object *src_obj = src->operator Object *();
-				GD_ERR_BREAK(!src_obj);
 
-				if (!ClassDB::is_parent_class(src_obj->get_class_name(), nc->get_name())) {
+				if (src_obj && !ClassDB::is_parent_class(src_obj->get_class_name(), nc->get_name())) {
 					err_text = "Trying to assign value of type '" + src_obj->get_class_name() +
 							   "' to a variable of type '" + nc->get_name() + "'.";
 					OPCODE_BREAK;
 				}
-
+#endif // DEBUG_ENABLED
 				*dst = *src;
 
 				ip += 4;
@@ -790,6 +799,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 				GET_VARIANT_PTR(dst, 2);
 				GET_VARIANT_PTR(src, 3);
 
+#ifdef DEBUG_ENABLED
 				Script *base_type = Object::cast_to<Script>(type->operator Object *());
 
 				GD_ERR_BREAK(!base_type);
@@ -825,6 +835,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 						OPCODE_BREAK;
 					}
 				}
+#endif // DEBUG_ENABLED
 
 				*dst = *src;