While discussing what is contained in the context collection, I'd like to clarify what exactly is being Add'ed in 400e and (the upcoming) 171b, and whether that also coincides with the collection items.
That is, if a context collection contains only simple objects, then the assumption is that context owner will only federate an Add out for simple objects. Likewise if the collection contains activities, then I'd expect Add(Like(Note)) to come from that owner.
However, a quick re-reading of 400e suggests that only simply objects are federated out via Add. That would tip the scale a bit toward the context containing only objects.
