docs: function() {
      var result = [];
  
      next: for (var i = 0; i < this.length; i++) {
        for (var j = 0; j < arguments.length; j++) {
          if (this[i] === arguments[j]) {
            continue next;
          }
        }
        result.push(this[i]);
      }
  
      return result;
    }