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}`
4. Dump the `$request->getAttribute('user_id')` in the middleware and in the destination controller.
5. 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.