New submission from Frank Feuerbacher <fr...@feuerbacher.us>:

This blasted Turkish I will be the death of us all...

https://www.unicode.org/versions/Unicode14.0.0/ch05.pdf has a lovely graphic on 
page 238 of the behavior of upper/lower casing of the various I's and when 
locale is Turkish or not. It seems that Python 3.9.5 is broken, and I see no 
evidence that version 10 has fixed it. 

Basically, U-0049 (I) should lower case to U-131 (ı) and vice-versa, when 
locale is tr_TR. The rules are different for other locales.

----------
files: foo.py
messages: 409733
nosy: fbacher
priority: normal
severity: normal
status: open
title: 'I'.lower() should give non dotted i for LANG=tr_TR
versions: Python 3.9
Added file: https://bugs.python.org/file50541/foo.py

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<https://bugs.python.org/issue46264>
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