anchor.diff:  /**
    * Chunked JSON parser that parses [String] chunks.
    */
  -class _JsonStringParser extends _ChunkedJsonParser {
  +class _JsonStringParser extends _ChunkedJsonParser<String> {
     String chunk;
     int chunkEnd;
   
  
positive.code:    *
     * Only used by [fail] to include the chunk in the thrown [FormatException].
     */
    get chunk;
  
    /**
     * Get charcacter/code unit of current chunk.
  
negative.code:   _JsonUtf8DecoderSink(reviver, this._sink, bool allowMalformed)
        : _parser = _createParser(reviver, allowMalformed);
  
    static _JsonUtf8Parser _createParser(reviver, bool allowMalformed) {
      _BuildJsonListener listener;
      if (reviver == null) {
        listener = new _BuildJsonListener();
  