Why loader/action response is optional?

[ziimakc]

What response is marked as optional in types? Is there a case where it can be not defined?

/**
 * Arguments passed to a route `loader` function
 */
export type LoaderFunctionArgs = RRLoaderFunctionArgs<AppLoadContext> & {
    context: AppLoadContext;
    response?: ResponseStub;
};

[kiliman]

Duplicate of #9326

#9326 (comment)