code: function trimList (args, next) {
          if (self._length === undefined || args.length <= self._length) {
            return next();
          }
  
          client.ltrim(self._container, 0, self._length, function dataStored (err) {
            if (err) {
              return next(err);
            }
  
            return next();
          });
        }
docs: Trim data list