[Python-ideas] RFC: PEP 540 version 3 (Add a new UTF-8 mode)

[INADA Naoki]

> Thanks Victor, I really like this version, and the next time I update
> PEP 538 I'm going to replace the en_US.UTF-8 fallback in the current
> proposal with a dependency on this PEP.
>

When using en_US.UTF-8 as fallback, pleas override only LC_CTYPE,
instead of LC_ALL.
As I described in other thread, LC_COLLATE may cause unintentional performance
regression and behavior changes.