Function lua_isuserdata

libs/lua/lapi.c:322–325

LUA_API int lua_isuserdata (lua_State *L, int idx) {
  const TValue *o = index2value(L, idx);
  return (ttisfulluserdata(o) || ttislightuserdata(o));
}


LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {