public static function is_integer(): bool
  {
    $args = \func_get_args();
    foreach ( $args as $a ){
      if ( \is_string($a) || (abs($a) > PHP_INT_MAX) ){
        if ( !preg_match('/^-?(\d+)$/', (string)$a) ){
          return false;
        }
      }
      else if ( !\is_int($a) ){
        return false;
      }
    }
    return true;
  }