add luafunction pointer to pushvalue

wrapper.go

@@ -207,6 +207,12 @@ func (s *State) PushValue(v any) error {
 		s.PushString(val)
 	case GoFunction:
 		return s.PushGoFunction(val)
+	case *LuaFunction:
+		C.lua_rawgeti(s.L, C.LUA_REGISTRYINDEX, C.int(val.ref))
+		if val.ref == C.LUA_NOREF || val.ref == C.LUA_REFNIL {
+			s.Pop(1)
+			s.PushNil()
+		}
 	case []int:
 		return s.pushIntSlice(val)
 	case []string: