Steps to reproduce:
1. Change the type of the id field of SimpleFoo from Long to String.
2. See tests fail, including testDummyCreate(..)
The root cause of the testDummyCreate(...) failure is that the datastoreId in the sideEffects field is different from the datastoreId returned in the results field. Need to track down other failing tests as well.
Rodrigo: since you were working on 1427, which is now obsolete, assigning it to you. Ray or I will check back with you tomorrow.