Added tag G68 for changeset 7ccb1568b578
Added tag G69 for changeset 0d91511e6462
fix #newObjectValueAtKeySubjectForKey: to use its method argument
Move state slots from Promise to Bender so both a promise and its resolver can access them without exposing them to their clients.
Hoist the nested promise message classes so we don't get new classes for every promise.
Merge.
Add comments for the slots in PromiseMessage.