anchor.diff:  
     Future commit(String commitMessage);
   
  -  /**
  -   * An implementation method; this should generally not be called by clients of
  -   * this API.
  -   */
  -  void fireStatusChangeEvent();
  +  void _fireStatusChangeEvent();
   }
   
   /**
  
positive.code: 
    Future<ObjectStore> get objectStore => _completer.future;
  
    void fireStatusChangeEvent() => _statusController.add(this);
  }
  
  /**
  
negative.code: 
    void _fireStatusChangeFor(Project project) {
      if (_operations[project] != null) {
        _operations[project]._fireStatusChangeEvent();
      }
    }
  }
  