#activitypub thonk: delivering to a Collection is nonsensical because a Collection could be an actor. but so can a Group

basically you have implicit behavior “the Collection needs to be expanded to its items which are assumed to all be actors” just like a Group might expand to all its members (except the assumption there is a bit stronger, you can generally expect a Group’s members to all be individuals?)

whereas something like WAC makes a distinction between agent, agentGroup, agentClass

#fediverse