code: @Override
    public Long sinterstore(final byte[] dstkey, final byte[]... keys) {
      checkIsInMultiOrPipeline();
      client.sinterstore(dstkey, keys);
      return client.getIntegerReply();
    }
docs: This commanad works exactly like {@link #sinter(byte[]...) SINTER} but instead of being returned
  the resulting set is stored as dstkey.
  <p>
  Time complexity O(N*M) worst case where N is the cardinality of the smallest set and M the
  number of sets
  @param dstkey
  @param keys
  @return Status code reply