Message 305812 - Python tracker

> Thus the following will start emitting DeprecationWarning by default again (as they did in 2.6 and earlier):
> - experiments at the REPL

This is backwards.  If there's one place where you *don't* want stderr polluted with warnings (or any kind of logging), it's an interactive prompt.

More generally, I think this entire proposal is unsound, and needs a PEP written to make its case clearly.