I was trying to point out that even if you connect a receiver using a lazy sender reference, say `post_save.connect(receiver, sender=settings.AUTH_USER_MODEL)` your receiver will receive the actual model class as the sender `kwarg`.

I thought it was worth a special mention of some kind -- maybe a warning is too bold here -- since it's the only signal working this way.

Looking back at it might be obvious enough to omit mentioning this subtle default signal deviation but I'd like to be sure that's what you understand on your first read.