anchor.diff:      var hash = loc.hash;
       var href = loc.href;
   
  -    final History history = window.history;
       switch (hash) {
         case "#reset":
           assert(href.endsWith(hash));
  
positive.code:         _aboutController.add(null);
          break;
        default:
          if (hash != '') loc.reload();
          break;
      }
    }
  
negative.code:       new Future.value(window.localStorage[key]);
  
    int get size {
      _sizeAccessed = true;
      var hash = (_urlHash == null) ? '7' : _urlHash;
      hash = hash.replaceAll('#', '');
      return int.parse(hash, onError: (e) => 7);
  