Mark Summerfield added the comment:
I think the str.casefold() docs are fine as far as they go, rightly covering
what it _does_ rather than _how_, yet providing a reference for the details.
But what they lack is more complete information. For example I discovered this:
>>> x = "files and shuffles"
>>> x
'files and shuffles'
>>> x.casefold()
'files and shuffles'
In view of this I would add one sentence:
In addition to lowercasing, this function also expands ligatures, for
example, "fi" becomes "fi".
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nosy: +mark
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