Allow numerical values in the username

src/Http/Controllers/SetupController.php

@@ -77,7 +77,7 @@ class SetupController extends Controller
             'settings.app_timezone' => 'required',
             'settings.app_locale'   => 'required',
             'settings.show_support' => 'boolean',
-            'user.username'         => 'alpha_dash|required',
+            'user.username'         => 'alpha_num|required',
             'user.email'            => 'email|required',
             'user.password'         => 'required'
         ]);

src/Models/User.php

@@ -34,7 +34,7 @@ class User extends Model implements UserInterface, RemindableInterface
      * @var string[]
      */
     protected $rules = [
-        'username' => 'required|alpha|unique:users',
+        'username' => 'required|alpha_num|unique:users',
         'email'    => 'required|email|unique:users',
         'password' => 'required',
     ];