anchor.diff:          (req, res) => req.parseBody().then((body) {
                 return req.parseQuery().then((query) {
                   return this.update(
  -                    parseId(req.params['id']),
  +                    parseId<Id>(req.params['id']),
                       body as Data,
                       mergeMap([
                         {'query': query},
  
positive.code:         (req, res) => req.parseBody().then((body) {
                return req.parseQuery().then((query) {
                  return this.modify(
                      parseId(req.params['id']),
                      body as Data,
                      mergeMap([
                        {'query': query},
  
negative.code:         (req, res) => req.parseBody().then((body) {
                return req.parseQuery().then((query) {
                  return this.update(
                      parseId<Id>(req.params['id']),
                      body as Data,
                      mergeMap([
                        {'query': query},
  