Issue #2885469 by Wim Leers, amateescu, timmillwood, alexpott, tstoeckler, xjm, remram, Berdir, dawehner, larowlan, samuel.mortenson: Regression: manually setting the ID field for newly-created content entities is not possible anymore (public follow-up to SA-2017-002)
Issue #2768651 by damiankloip, Wim Leers, mpdonadio, Munavijayalakshmi, Jo Fitzgerald, jhedstrom: Let TimestampItem (de)normalize to/from RFC3339 timestamps, not UNIX timestamps, for better DX
