Symfony version(s) affected: 4.2.2

Description
Symfony 4 redirects (301) a route containing a route param when the route param ends with a trailing slash. Route parameters allow a trailing slash if configured as shown here. Symfony 4 should detect that the route param has a trailing slash and not return a redirect response.

Lets test the expected behavior first in Symfony 3.4

**Correct behavior in Symfony 3.4 **
Step 1. Set your route

#app/config/routing.yml
index:
    path:       /share/{token}
    controller:  AppBundle:Default:token
    defaults:
        token: null
    requirements:
        token: .+

Step 2. Implement the action

// src/AppBundle/Controller/DefaultController.php
class DefaultController extends Controller
{
    /**
     * @param Request $request
     *
     * @param $token
     *
     * @return Response
     */
    public function tokenAction(Request $request, $token = null)
    {
        return new Response(
            'token is ' . $token
        );
    }
}

Step 3. Serve the application and visit the path http://127.0.0.1:8000/share/token/
Below output is the expected and correct output.
token is token/
Now lets see what Symfony 4.2 does.

Incorrect behavior in Symfony 4.2
Step 1. Set your route

# config/routes.yaml
index:
    path:       /share/{token}
    controller:  App\Controller\DefaultController::index
    requirements:
        token: .+

Step 2. Implement the action

// src/Controller/DefaultController.php
    /**
     * @param Request $request
     * @param $token
     *
     * @return Response
     */
    public function index( Request $request, $token ) : Response
    {
        return new Response(
            'token is ' . $token
        );
    }

Step 3. Serve the application and visit the path http://127.0.0.1:8000/share/token/
Below output is the incorrect output.
token is token

the webserver log is

[Fri Jan 18 17:58:32 2019] 127.0.0.1:13835 [301]: /share/token/
2019-01-18T06:58:32+00:00 [info] Matched route "index".
[Fri Jan 18 17:58:32 2019] 127.0.0.1:13836 [200]: /share/token