Convert null objects to nil in Lua

Author: gilzoide

CHANGELOG.md

@@ -25,6 +25,7 @@
   ```lua
   MyScript.exported_dictionary = export(Dictionary)
   ```
+- Convert null Object Variants (`<Object#null>`) to `nil` when passing them to Lua
 
 
 ## [0.5.0](https://github.com/gilzoide/lua-gdextension/releases/tag/0.5.0)

src/utils/convert_godot_lua.cpp

@@ -184,6 +184,10 @@ sol::stack_object lua_push(lua_State *lua_state, const Variant& value) {
 			break;
 
 		case Variant::OBJECT:
+			if ((Object *) value == nullptr) {
+				sol::stack::push(lua_state, sol::nil);
+				break;
+			}
 			if (LuaObject *lua_obj = Object::cast_to<LuaObject>(value)) {
 				if (LuaState::find_lua_state(lua_state) == lua_obj->get_lua_state()) {
 					sol::stack::push(lua_state, lua_obj->get_lua_object());

test/lua_tests/null_object.lua

@@ -0,0 +1 @@
+assert(instance_from_id(0) == nil)

test/lua_tests/null_object.lua.uid

@@ -0,0 +1 @@
+uid://d043pcf3pr0ak