docs: public long stopStartTimer(long _expiryTime, Entry<K,V> e) {
      if ((_expiryTime > 0 && _expiryTime < Long.MAX_VALUE) || _expiryTime < 0) {
        throw new IllegalArgumentException("invalid expiry time, cache is not initialized with expiry: " + Util.formatMillis(_expiryTime));
      }
      return _expiryTime == 0 ? Entry.EXPIRED : _expiryTime;
    }