code: public void update(final long[] data) {
      if ((data == null) || (data.length == 0)) { return; }
      couponUpdate(coupon(hash(data, DEFAULT_UPDATE_SEED)));
    }
docs: Present the given long array as a potential unique item.
  If the long array is null or empty no update attempt is made and the method returns.
  
  @param data The given long array.