I think that the (pardon the expression) arc of the history of AFCIs reflects some silly reasoning. Why did we require AFCIs only in the bedroom? In many houses, the bedrooms are upstairs. A fire...
On the other hand, there's no doubt here what constitutes a "branch" circuit!! (Answer: they all do)
Yep, I grew up believing that hot dogs all had about a half inch of raw meat on each end. (1950s)
Your comment brought a smile to my face!