code: function _shouldDeliverToObserver(activeChanges, acceptList, changeType) {
          var doesAccept = false;
          if (acceptList) {
              for (var i = 0, l = acceptList.length; i < l; i++) {
                  var accept = acceptList[i];
                  if (activeChanges[accept] > 0) {
                      return false;
                  }
                  if (accept === changeType) {
                      doesAccept = true;
                  }
              }
          }
          return doesAccept;
      }
docs: Implementation of the internal algorithm 'ShouldDeliverToObserver' described in the proposal. [Corresponding Section in ECMAScript wiki](http://wiki.ecmascript.org/doku.php?id=harmony:observe_internals#shoulddelivertoobserver)