anchor.diff:  
       this.port.receive((message, SendPort replyTo) {
         if (message != SERVERSHUTDOWN) {
  +        _readBytes = 0;
           _errorEvents = 0;
           _dataEvents = 0;
           _closeEvents = 0;
  
positive.code:   SendPort _sendPort;
    Socket _socket;
    List<int> _buffer;
    int _dataEvents;
    int _closeEvents;
    int _errorEvents;
  
negative.code:   SocketClose.start(mode)
        : _receivePort = new ReceivePort(),
          _sendPort = null,
          _readBytes = 0,
          _dataEvents = 0,
          _closeEvents = 0,
          _errorEvents = 0,
  