[issue1813] Codec lookup failing under turkish locale

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

There is also a locale normalization function in unicodeobject.c: normalize_encoding(). This function uses "if (ISUPPER(*e)) *l++ = TOLOWER(*e++);" which uses the Python, *locale-independent*, implementation of ctype.

We should maybe use the ISUPPER / TOLOWER in codecs.c.

Anyway, a function should be fixed, but I don't know which one :-)

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