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There is a shallow bug, namely that

locale._parse_localename("de_DE@euro")

crashes; it should return the same value that it does for
de_DE, or perhaps it should have hard-coded knowledge that
the codeset is iso-8859-15.

There is a deeper underlying bug that getdefaultlocale is a
hopeless case. I'll be adding a locale.getpreferredencoding
function to make getdefaultlocale unnecessary.