def popmin_compat(self, count=1):
        """
        Atomically remove the lowest-scoring item(s) in the set. Compatible
        with Redis versions < 5.0.

        :returns: a list of item, score tuples or ``None`` if the set is empty.
        """
        pipe = self.database.pipeline()
        r1, r2 = (pipe
                  .zrange(self.key, 0, count - 1, withscores=True)
                  .zremrangebyrank(self.key, 0, count - 1)
                  .execute())
        return r1