The following heuristic has become increasingly true over the last couple of decades: If you have some kind of "charset" configuration anywhere, and it's not UTF-8, it's wrong.
Python 2 was charset agnostic, so it always worked, but the improvement with Python 3 was not only an improvement – how to tell a Python 3 script from a Python 2 script?
* If it contains the string "utf-8", it's Python3.
* If it only works if your locale is C.UTF-8, it's Python3.
Needless to say, I welcome this change. The way I understand it, it would "repair" Python 3.