docs: static long limitExpiryToMaxLinger(long now, long _maxLinger, long _requestedExpiryTime, boolean _sharpExpiryEnabled) {
      if (_sharpExpiryEnabled && _requestedExpiryTime > ExpiryPolicy.REFRESH && _requestedExpiryTime < ExpiryPolicy.ETERNAL) {
        _requestedExpiryTime = -_requestedExpiryTime;
      }
      return Expiry.mixTimeSpanAndPointInTime(now, _maxLinger, _requestedExpiryTime);
    }