strncasecmp("ß", "ẞ", 2) = ?
I chose ß just because it's the first char that came to mind where length in bytes of uppercase form ẞ differs. "SS" is a distraction, not relevant here. Choosing an example from some IPA-block form where opposite-case was added later would be less confusing.
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The fundamental problem is that strncasecmp is specified in terms of n bytes of s1, but that could require inspecting considerably more than n bytes of s2, which is highly counterintuitive and can't be antisymmetric in s1,s2.
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