docs: def zrevrangebylex(self, name, max, min, start=None, num=None):
          """
          Return the reversed lexicographical range of values from the sorted set
           between ``max`` and ``min``.
  
          If ``start`` and ``num`` are specified, then return a slice of the
          range.
  
          :param name: str     the name of the redis key
          :param max: int or '+inf'
          :param min: int or '-inf'
          :param start: int
          :param num: int
          :return: Future()
          """
          with self.pipe as pipe:
              f = Future()
              res = pipe.zrevrangebylex(self.redis_key(name), max, min,
                                        start=start, num=num)
  
              def cb():
                  f.set([self.valueparse.decode(v) for v in res])
  
              pipe.on_execute(cb)
              return f