Let’s not put the carriage before the horse. First I would like to hear some feedback from original proposal authors and implementers (@johnno1962, @beccadax, @rintaro), maybe there’s a reason for the third rule I’m not seeing…
It would also help if somebody from core team (@Joe_Groff, @Chris_Lattner3) could recall the reasoning that made them support the third rule “in this go-around."