anchor.diff:            markToken(data['_id'], result);
           });
   
  -        event["change"].strictlyChanged.forEach((DataMap data, ChangeSet changeSet) {
  -//          Map change = {};
  -//          changeSet.changedItems.forEach((k, Change v) => change[k] = v.newValue);
  +        change.strictlyChanged.forEach((DataMap data, ChangeSet changeSet) {
             Future result = _connection.send(() => new ClientRequest("sync", {
               "action" : "change",
               "collection" : collectionName,
  
positive.code:           }));
            markToken(data['_id'], result);
          });
        }
      }));
    }
  
negative.code:       });
      }
  
      var change = new ChangeSet();
  
      notify(){
        new Timer(new Duration(), (){
          change.addedItems.forEach((data) {
            Future result = _connection.send(() => new ClientRequest("sync", {
              "action" : "add",
              "collection" : collectionName,
  