int GO_index(lua_State * L)
{
    //Stack as expected                                                     [..., GO, key]
    lua_GameObject * go_lua = (lua_GameObject *)luaL_checkudata(L, -2, "__GameObject__");
    const char * key = lua_tostring(L, -1);
    std::string val = go_lua->go->getField(key);
    if (!val.empty())
    {
        lua_pushstring(L, val.c_str());
    }
    else
    {
        //See if the metatable has what they are asking for. (Like a method name)
        luaL_getmetatable(L, "__GameObject__");                                 //[complex_inst, key, Complex-metatable]
                                                                                //Make a copy of the key at the top of the stack
        lua_pushvalue(L, -2);
        //Gets the field from the table at index -2 using the key at the stack top
        lua_rawget(L, -2);                                                      //[complex_inst, key, Complex-metatable, nil/value]
    }
    return 1;
}