>but claiming solutions could exist without breaking back-compat is just not right. I mean, you have a good point on C extensions but code relying on them (wit

>but claiming solutions could exist without breaking back-compat is just not right. I mean, you have a good point on C extensions but code relying on them (without a really portable API) is almost never going to be forward compatible anyway. (There are still quite a few C extensions not up to CPython 3 yet.)