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gh-155292: Don't consider Unicode codepoint attributes outside RFC 3454 (GH-155293)
Merged revisions 55007-55179 via svnmerge from
Rip out all the u"..." literals and calls to unicode().
Avoid forward-declaring the methods array.
Update Unicode database to Unicode 4.1.
Applying SF patch #949329 on behalf of Raymond Hettinger.
Implement IDNA (Internationalized Domain Names in Applications).