Laravel 5 controller sending JSON integer as string

php json laravel laravel-5 php-5.6

PHP Snippet 1:

return response()->json(["foo" => "bar"], 200, [], JSON_NUMERIC_CHECK);

PHP Snippet 2:

return (int)Post::find(1)->id;

PHP Snippet 3:

class Controller extends BaseController {
    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;

    public static function json($json) {
        return response()->json($json, 200, [], JSON_NUMERIC_CHECK);
    }

PHP Snippet 4:

return self::json($all);