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bug#17130: 24.4.50; Deficient Unicode case folding

From: nbtrap
Subject: bug#17130: 24.4.50; Deficient Unicode case folding
Date: Fri, 28 Mar 2014 15:31:09 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> M-: (compare-strings "σ" nil nil "ς" nil nil t)
>> ==> -1  ;; should be t
> No, because these characters are not a case pair.

They're not a case pair in Emacs, but they should compare equally under
Unicode case folding.

>> Can someone that knows a thing about Unicode and emacs case tables speak
>> to whether the latter could suffice for implementing full Unicode case
>> folding?
> What is "full Unicode case folding"?

Somthing that implements this:

And perhaps more.  I don't know, but someone on this list probably does.

If you look about a third of the way down, there's a line saying that
U+03C2 (ς) should fold into U+03C3 (σ).

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