code: @Override
    public Set<byte[]> smembers(final byte[] key) {
      checkIsInMultiOrPipeline();
      client.smembers(key);
      return SetFromList.of(client.getBinaryMultiBulkReply());
    }
docs: Return all the members (elements) of the set value stored at key. This is just syntax glue for
  {@link #sinter(byte[]...)} SINTER}.
  <p>
  Time complexity O(N)
  @param key the key of the set
  @return Multi bulk reply