[issue36945] Add _PyPreConfig.configure_locale: allow to leave LC_CTYPE unchanged when embedding Python

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I asked on Twitter: "If you embed Python in your application, would you prefer Python to leave your locale unchanged?"

Mai Giménez replied: "I would like to."
https://twitter.com/maidotgimenez/status/1129357352774393856

Steve Dower wrote:
"I think this should be opt-in, not opt-out."

I count at least two users who would like to get such option, so my idea wasn't stupid :-)

I updated my PR and I plan to merge it soon.

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<https://bugs.python.org/issue36945>
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