anchor.diff:  
         var info = parseLinkHeader(response.headers['link']);
   
  -      if (!info.containsKey(reverse ? "prev" : "next")) {
  +      if (!info.containsKey("next")) {
           controller.close();
           return;
         }
  
positive.code:   PaginationHelper(this.github);
  
    Stream<http.Response> fetchStreamed(String method, String path, {int pages,
        bool reverse: false, int start, Map<String, String> headers,
        Map<String, dynamic> params, String body, int statusCode: 200}) {
      if (headers == null) headers = {};
      var controller = new StreamController.broadcast();
  
  
negative.code:   }
  
    Stream<T> objects(String method, String path, JSONConverter converter,
        {int pages, int start, Map<String, String> headers,
        Map<String, dynamic> params, String body, int statusCode: 200,
        String preview}) {
      if (headers == null) headers = {};
  