In the middleware request attributes does not parsed and filled to the object

[roquie]

How to reproduce?

1. Register middleware with following code:

class Test implements \Psr\Http\Server\MiddlewareInterface {
    /**
     * Process an incoming server request and return a response, optionally delegating
     * response creation to a handler.
     */
    public function process(
        \Psr\Http\Message\ServerRequestInterface $request,
        \Psr\Http\Server\RequestHandlerInterface $handler
    ): \Psr\Http\Message\ResponseInterface {
        
        dump($request->getAttribute('user_id'));

        return $handler->handle($request);
    }
};

$app->use(Test::class);

2. Register container or callback with route attribute, like /user/{user_id}
3. Dump the $request->getAttribute('user_id') in the middleware and in the destination controller.
4. Run it.

Attribute user_id allows use only in the controller handler (__invoke). In the middleware attribute value will be equals null.

This is a bug or feature? :)

How I can validate incoming route attributes? :)

[roquie]

Request attributes does not passing here, but it no need for me any more. Validation of route attributes moved to controller __invoke because validation rules in most cases unique for each case.