[issue19083] IDNA prefix should be case insensitive

[STINNER Victor]

STINNER Victor added the comment:

Could you also add a test using a IDNA domain not starting with XN--, but with XN-- in the middle? Example:

self.assertEqual(str(b"bugs.XN--pythn-mua.org.", "idna"), "bugs.pyth\xf6n.org.")

And maybe also with mixed cases: Xn-- and xN-- prefixes.

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<http://bugs.python.org/issue19083>
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