Over time, I have repeatedly stared at this code again and again
wondering if (and why) our cv signaling is correct, just to end up
with the same insight each time (but first overlooking #2719)

Being fully aware that we do not want to plaster our code with
outdated comments, I hope this explanation is warranted to save myself
(and others, hopefully) from wasting precious life time on reiterating
over the same question.