anchor.diff:      stringifier.writeObject(object);
     }
   
  +  String get _partialResult => _sink is StringBuffer ? _sink.toString() : null;
  +
     void writeNumber(num number) {
       _sink.write(number.toString());
     }
  
positive.code: 
    _JsonStringifier(toEncodable(o))
        : _toEncodable = toEncodable ?? _defaultToEncodable;
  
    /** Append a string to the JSON output. */
    void writeString(String characters);
  
negative.code:     buffer = null;
      index = 0;
    }
  
    String get _partialResult => null;
  
    void writeNumber(num number) {
      writeAsciiString(number.toString());
  