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