anchor.diff:      parent.appendChild(node);
     }
   }
  +
  +enum _SyncOperation { IDENTICAL, INSERTION, STATEFUL, STATELESS, REMOVAL }
   
   /*
    * All Effen nodes derive from Node. All nodes have a _parent, a _key and
  
positive.code:   }
  }
  
  List<Component> _dirtyComponents = new List<Component>();
  Set<Component> _mountedComponents = new HashSet<Component>();
  Set<Component> _unmountedComponents = new HashSet<Component>();
  
  bool _buildScheduled = false;
  bool _inRenderDirtyComponents = false;
  
  void _notifyMountStatusChanged() {
    _unmountedComponents.forEach((c) => c._didUnmount());
    _mountedComponents.forEach((c) => c._didMount());
    _mountedComponents.clear();
    _unmountedComponents.clear();
  }
  
  void _buildDirtyComponents() {
    Stopwatch sw;
  
negative.code:     }
  
      if (oldBuilt == null)
        _enqueueDidMount(this);
  
      int lastOrder = _currentOrder;
      _currentOrder = _order;
  