Laravel正则表达式常量允许无效参数

I'm using Laravel 5.6

I have the following route that I want to allow only numeric values to be passed to id:

Route::group(['middleware' => ['auth.jwt']], function () {
    Route::get('endpoint/{id}/something', 'API\MyController@myMethod')
        ->where(['id' => '[0-9]+']);
});

• Method assignature: public function myMethod($id)

But even when I pass a non-numeric value to id, it's passing to MyController @myMethod, it's NOT preventing from executing the route.

Tried via the RouterServiceProvider.php, without success too:

public function boot()
{
    Route::pattern('id', '[0-9]+');
    parent::boot();
}

Any ideas?

i don't know to prevent the user from entering a non-decimal value, but if i want to achieve the same result i will check first thing in myMethod() for the $id if isn't a decimal i will abort(404) or redirect user back with some message.