anchor.diff:      _appendImpl(item);
     }
   
  -  /// Implementation
  +  /// Append implementation
     void _appendImpl(DartItem item) {
       if (_stack.size() == 0) {
         // Empty stack, straight add
  
positive.code:       if (entry.complete) {
          _stack.push(item);
        } else {
          entry.data.add(item.data);
          if (entry.data.length == entry.targetSize) {
            entry.complete = true;
          }
        }
      }
  
negative.code:   /// Used to indicate what the
    /// next decoded item should be.
    whatsNext _next = whatsNext.nothing;
  
    /// Temporary map to asssemble a key/value pair
    Map<dynamic, dynamic> _tmpMap;
  
    /// Temporary map key,int or string
    dynamic _mapKey;
  
    /// Temporary map value
    dynamic _mapValue;
  
    void onInteger(int value) {
      // Do not add nulls
  