From: Guido van Rossum firstname.lastname@example.org
But what am I to do? c.l.py may not be representative, but neither is python-dev, and I'd like to get feedback from as many folks as possible. Maybe it's just a matter of wording -- make it clear that the feedback won't necessarily affect the PEP unless I like what's being said. But that will still cause certain folks to bitch. Sigh.
I have the impression (at least for 285) that you got enough feeback on the technical points from python-dev.
For the rest the important aspects are:
breakage you typically know what a change will breaks, OTOH you might not know how much code will be concretely affected, for that you could use the experimental track to get feedback from people, admitting that they will try things out and report honestly. But my very personal impression is that you prefer a bit asymptotic language purity over avoiding breakage, so you should expect some over-violent reactions.
newbie friendliness and teaching: I'm happy I am not the BDFL of a self-declared newbie-friendly language <wink>.