docs: public int compareIntervalOrder(Interval<E> other)
    {
      int flags = getRelationFlags(other);
      if (checkFlagExclusiveSet(flags, REL_FLAGS_INTERVAL_BEFORE, REL_FLAGS_INTERVAL_UNKNOWN)) {
        return -1;
      } else if (checkFlagExclusiveSet(flags, REL_FLAGS_INTERVAL_AFTER, REL_FLAGS_INTERVAL_UNKNOWN)) {
        return 1;
      } else {
        return 0;
      }
    }