Re: [BUG] 'non-empty string' >? '' returns false on amd64 arch

Also mb_strnicmp() assumes that lowercase and uppercase characters
have the same length in UTF-8 representation. This isn't the case.
Here are a few counterexamples:

$ python -c 'print " ".join(["0x%.2X" % n for n in range(65536) if
len(unichr(n).encode("utf8")) !=
len(unichr(n).lower().encode("utf8"))])'

0x130 0x23A 0x23E 0x1E9E 0x2126 0x212A 0x212B 0x2C62 0x2C64 0x2C6D 0x2C6E 0x2C6F

So I think the UTF-8 part of mb_strncimp() needs to be completely rewritten.

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