On Monday 08 April 2002 23:00, Guido van Rossum wrote:
the concept of 'undefined behavior' is, I believe, known widely enough to rely on it a bit, at least where the docs mention it).
Tell that to the people who write L.append(1, 2, 3) despite that it was never documented. :-(
I do -- if and when I see that (haven't seen it in ages). Technical managers at development shops know about stuff "accidentally working" and are more tolerant of bug-fixes against that than of other backwards-compatibility breaks, in my experience.