Laravel 5.3 ResourceController uses both 'as' and 'prefix' for the route name prefix

Route::group( ['prefix' => 'admin', 'as' => 'admin.', 'namespace' => 'Admin'], function () {

    Route::group(['as' => 'user.'], function(){

        Route::get('custom', [
            'as' => 'custom',
            'uses' => 'UserController@custom'
        ]);     

        // Results in admin.user.custom

    }); 


    Route::resource('user', 'UserController');
    // Route names
    // admin.admin.user.index
    // admin.admin.user.create
    // admin.admin.user.store
    // etc..
});

from : https://github.com/laravel/framework/issues/13903