anchor.diff:      return completer.future;
     }
   
  -  Future pong(int id) {
  +  Future _pong(int id) {
       Completer completer = _serviceCallCompleters[id];
       _serviceCallCompleters.remove(id);
       completer.complete("pong");
  
positive.code:   Future onceIsolateReady;
  
    _IsolateHandler() {
      // TODO(ericarnold): Implement
    }
  
  
negative.code:         _sendPort = arg;
          _readyController..add(null)..close();
        } else {
          // TODO(ericarnold): Temporary (encode ping command once implemented)
          _pong(arg);
        }
      });
  
  