5 files changed, 38 insertions, 11 deletions
diff --git a/core/object/make_virtuals.py b/core/object/make_virtuals.py
index 0ee95835a6..18f27ae4a4 100644
--- a/core/object/make_virtuals.py
+++ b/core/object/make_virtuals.py
@@ -72,6 +72,7 @@ def generate_version(argcount, const=False, returns=False):
         s = s.replace("$RVOID", "(void)r_ret;")  # If required, may lead to uninitialized errors
         s = s.replace("$CALLPTRRETDEF", "PtrToArg<m_ret>::EncodeT ret;")
         method_info += "\tmethod_info.return_val = GetTypeInfo<m_ret>::get_class_info();\\\n"
+        method_info += "\tmethod_info.return_val_metadata = GetTypeInfo<m_ret>::METADATA;\\\n"
     else:
         s = s.replace("$RET", "")
         s = s.replace("$RVOID", "")
@@ -113,6 +114,9 @@ def generate_version(argcount, const=False, returns=False):
         )
         callptrargsptr += "&argval" + str(i + 1)
         method_info += "\tmethod_info.arguments.push_back(GetTypeInfo<m_type" + str(i + 1) + ">::get_class_info());\\\n"
+        method_info += (
+            "\tmethod_info.arguments_metadata.push_back(GetTypeInfo<m_type" + str(i + 1) + ">::METADATA);\\\n"
+        )
 
     if argcount:
         callsiargs += "};\\\n"
diff --git a/core/object/object.cpp b/core/object/object.cpp
index 2cb56dfe6c..57aa1339ec 100644
--- a/core/object/object.cpp
+++ b/core/object/object.cpp
@@ -499,7 +499,7 @@ void Object::get_property_list(List<PropertyInfo> *p_list, bool p_reversed) cons
 	_get_property_listv(p_list, p_reversed);
 
 	if (!is_class("Script")) { // can still be set, but this is for user-friendliness
-		p_list->push_back(PropertyInfo(Variant::OBJECT, "script", PROPERTY_HINT_RESOURCE_TYPE, "Script", PROPERTY_USAGE_DEFAULT));
+		p_list->push_back(PropertyInfo(Variant::OBJECT, "script", PROPERTY_HINT_RESOURCE_TYPE, "Script", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_NEVER_DUPLICATE));
 	}
 
 	if (script_instance && !p_reversed) {
@@ -1549,7 +1549,9 @@ void Object::_bind_methods() {
 #define BIND_OBJ_CORE_METHOD(m_method) \
 	::ClassDB::add_virtual_method(get_class_static(), m_method, true, Vector<String>(), true);
 
-	BIND_OBJ_CORE_METHOD(MethodInfo("_notification", PropertyInfo(Variant::INT, "what")));
+	MethodInfo notification_mi("_notification", PropertyInfo(Variant::INT, "what"));
+	notification_mi.arguments_metadata.push_back(GodotTypeInfo::Metadata::METADATA_INT_IS_INT32);
+	BIND_OBJ_CORE_METHOD(notification_mi);
 	BIND_OBJ_CORE_METHOD(MethodInfo(Variant::BOOL, "_set", PropertyInfo(Variant::STRING_NAME, "property"), PropertyInfo(Variant::NIL, "value")));
 #ifdef TOOLS_ENABLED
 	MethodInfo miget("_get", PropertyInfo(Variant::STRING_NAME, "property"));
diff --git a/core/object/object.h b/core/object/object.h
index f78c7c34fd..5ec69a371b 100644
--- a/core/object/object.h
+++ b/core/object/object.h
@@ -109,15 +109,16 @@ enum PropertyUsageFlags {
 	PROPERTY_USAGE_CLASS_IS_ENUM = 1 << 16,
 	PROPERTY_USAGE_NIL_IS_VARIANT = 1 << 17,
 	PROPERTY_USAGE_ARRAY = 1 << 18, // Used in the inspector to group properties as elements of an array.
-	PROPERTY_USAGE_DO_NOT_SHARE_ON_DUPLICATE = 1 << 19, // If the object is duplicated also this property will be duplicated.
-	PROPERTY_USAGE_HIGH_END_GFX = 1 << 20,
-	PROPERTY_USAGE_NODE_PATH_FROM_SCENE_ROOT = 1 << 21,
-	PROPERTY_USAGE_RESOURCE_NOT_PERSISTENT = 1 << 22,
-	PROPERTY_USAGE_KEYING_INCREMENTS = 1 << 23, // Used in inspector to increment property when keyed in animation player.
-	PROPERTY_USAGE_DEFERRED_SET_RESOURCE = 1 << 24, // when loading, the resource for this property can be set at the end of loading.
-	PROPERTY_USAGE_EDITOR_INSTANTIATE_OBJECT = 1 << 25, // For Object properties, instantiate them when creating in editor.
-	PROPERTY_USAGE_EDITOR_BASIC_SETTING = 1 << 26, //for project or editor settings, show when basic settings are selected.
-	PROPERTY_USAGE_READ_ONLY = 1 << 27, // Mark a property as read-only in the inspector.
+	PROPERTY_USAGE_ALWAYS_DUPLICATE = 1 << 19, // When duplicating a resource, always duplicate, even with subresource duplication disabled.
+	PROPERTY_USAGE_NEVER_DUPLICATE = 1 << 20, // When duplicating a resource, never duplicate, even with subresource duplication enabled.
+	PROPERTY_USAGE_HIGH_END_GFX = 1 << 21,
+	PROPERTY_USAGE_NODE_PATH_FROM_SCENE_ROOT = 1 << 22,
+	PROPERTY_USAGE_RESOURCE_NOT_PERSISTENT = 1 << 23,
+	PROPERTY_USAGE_KEYING_INCREMENTS = 1 << 24, // Used in inspector to increment property when keyed in animation player.
+	PROPERTY_USAGE_DEFERRED_SET_RESOURCE = 1 << 25, // when loading, the resource for this property can be set at the end of loading.
+	PROPERTY_USAGE_EDITOR_INSTANTIATE_OBJECT = 1 << 26, // For Object properties, instantiate them when creating in editor.
+	PROPERTY_USAGE_EDITOR_BASIC_SETTING = 1 << 27, //for project or editor settings, show when basic settings are selected.
+	PROPERTY_USAGE_READ_ONLY = 1 << 28, // Mark a property as read-only in the inspector.
 
 	PROPERTY_USAGE_DEFAULT = PROPERTY_USAGE_STORAGE | PROPERTY_USAGE_EDITOR,
 	PROPERTY_USAGE_NO_EDITOR = PROPERTY_USAGE_STORAGE,
@@ -222,6 +223,16 @@ struct MethodInfo {
 	int id = 0;
 	List<PropertyInfo> arguments;
 	Vector<Variant> default_arguments;
+	int return_val_metadata = 0;
+	Vector<int> arguments_metadata;
+
+	int get_argument_meta(int p_arg) const {
+		ERR_FAIL_COND_V(p_arg < -1 || p_arg > arguments.size(), 0);
+		if (p_arg == -1) {
+			return return_val_metadata;
+		}
+		return arguments_metadata.size() > p_arg ? arguments_metadata[p_arg] : 0;
+	}
 
 	inline bool operator==(const MethodInfo &p_method) const { return id == p_method.id; }
 	inline bool operator<(const MethodInfo &p_method) const { return id == p_method.id ? (name < p_method.name) : (id < p_method.id); }
diff --git a/core/object/script_language.cpp b/core/object/script_language.cpp
index df5486512d..61f5cfc22a 100644
--- a/core/object/script_language.cpp
+++ b/core/object/script_language.cpp
@@ -369,6 +369,14 @@ void ScriptServer::save_global_classes() {
 	ProjectSettings::get_singleton()->store_global_class_list(gcarr);
 }
 
+bool ScriptServer::has_global_classes() {
+	return !global_classes.is_empty();
+}
+
+String ScriptServer::get_global_class_cache_file_path() {
+	return ProjectSettings::get_singleton()->get_global_class_list_path();
+}
+
 ////////////////////
 
 Variant ScriptInstance::call_const(const StringName &p_method, const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
diff --git a/core/object/script_language.h b/core/object/script_language.h
index f82b58439f..b1393c7196 100644
--- a/core/object/script_language.h
+++ b/core/object/script_language.h
@@ -91,6 +91,8 @@ public:
 	static void get_global_class_list(List<StringName> *r_global_classes);
 	static void get_inheriters_list(const StringName &p_base_type, List<StringName> *r_classes);
 	static void save_global_classes();
+	static bool has_global_classes();
+	static String get_global_class_cache_file_path();
 
 	static void init_languages();
 	static void finish_languages();