docs: function _data(data) {
    if(this.tcp) {
      this.decoder.write(data);
    // connected to an in-process server,
    // emit the reply from the server socket
    }else{
      if(data instanceof Error) {
        this.emit('reply', data, null);
      }else{
        this.emit('reply', null, data);
      }
    }
  }