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This statement is no longer correct: "when python starts, it runs using the C locale, on any platform (Windows, Linux, BSD), any python version (2, 3...), until locale.setlocale() is used to set another locale."
The Python 3 text model doesn't work properly in the legacy C locale due to the assumption of ASCII as the preferred text encoding, so we run setlocale(LC_ALL, "") early in the startup sequence in order to switch to something more sensible. In Python 3.7+, we're even more opinionated about that, and explicitly coerce the C locale to a UTF-8 based one if there's one available.
If our docs are still saying otherwise anywhere, then our docs are outdated, and need to be fixed.