code: @Override
    public Long srem(final byte[] key, final byte[]... member) {
      checkIsInMultiOrPipeline();
      client.srem(key, member);
      return client.getIntegerReply();
    }
docs: Remove the specified member from the set value stored at key. If member was not a member of the
  set no operation is performed. If key does not hold a set value an error is returned.
  <p>
  Time complexity O(1)
  @param key the key of the set
  @param member the set member to remove
  @return Integer reply, specifically: 1 if the new element was removed 0 if the new element was
  not a member of the set