> I think Ezio found some other information somewhere.

While I was fixing #7000 I found that the tests for capwords had been
removed in r54854 but since the function was already there I added them
back in r75072.
The commit message of r54854 says "Also remove all calls to functions in
the string module (except maketrans)". I'm adding Neal to the nosy list,
maybe he remembers if maketrans really was the only function that was
supposed to survive.

In #6412 other problems of .title() are discussed, and there are also a
couple of links to Technical Reports of the Unicode Consortium about
casing algorithms and similar issues (I didn't have time to read them
yet though).