Łukasz,

Congratulations! I've accepted PEP 443. I've already marked it as
Accepted in the repo. I've also applied some very minor edits in order
to make the text flow a little better in a few places. I think this is
a great PEP -- it's simple, doesn't overreach, and you've managed the
bikeshedding admirably. Thank you for your great contribution to
Python!