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int typel_mtindex(lua_State *state) {	typel_inst *inst = lua_touserdata(state, 1);	typel_class *type = inst->type;	char *attrname = lua_tostring(state, 2);	int result = 0;	if(!inst->self) { lua_pushnil(state); return 1; }	if(type->getattr)		result = type->getattr(state, inst->self, attrname);	if(!result) {		// the attribute was not handled by the getattr method		// next, try the prototype table		sl_pushref(state, type->protoref);		lua_getfield(state, -1, attrname);		if(lua_isnil(state, -1)) {			lua_pop(state, 2); // clean up the stack			// then try the data table associated with the instance			//lua_pushvalue(state,-1			sl_pushref(state, inst->dataref);			lua_getfield(state, -1, attrname);			if(lua_isnil(state, -1)) {				// there is no such attribute; push nil				lua_pop(state, 1);				lua_pushnil(state);			}		}		lua_replace(state, -2);	}	return 1;}int typel_mtnewindex(lua_State *state) {	typel_inst *inst = lua_touserdata(state, 1);	typel_class *type = inst->type;	char *attrname = lua_tostring(state, 2);	if(!inst->self) { return 0; }	int result = 0;	if(type->setattr)		result = type->setattr(state, inst->self, attrname);	if(!result) { /* TODO: error */ }	return 0;}