Connect seems to be exactly what I need, but I’m having second thoughts since you mentioned it would be easier to supply the full array.
In my case, a user is basically “liking” a post. Wouldn’t it be worse all around if I had to query the post for all users who previously liked the post, and then add my new user onto that, and then do another call to update the whole array? I also worry about situations where 2 users would click “like” at the same time, they’d both query the existing likes, they’d both append only their id, and because of various syncing issues their could be data loss.