[issue37848] More fully implement Unicode's case mappings

[Greg Price]

Greg Price <gnprice at gmail.com> added the comment:

(I should add that it was only after doing the reading that produced the OP that I had a clear idea what I thought the priority of the issue was -- before doing that work I didn't have a clear sense of the scope of what it affects. Based on that SpecialCasing.txt file as of Unicode 12.0.0, I believe the functionality we don't currently support is entirely about the handling of certain versions of the Latin letter I, as treated in Lithuanian, Turkish, and Azerbaijani. Though one function of this issue thread is that it would be a great place to point out if there's another component to it!)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37848>
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