bug#17130: 24.4.50; Deficient Unicode case folding

[Eli Zaretskii]

> From: Nathan Trapuzzano <nbtrap@nbtrap.com>
> Date: Fri, 28 Mar 2014 08:07:20 -0400
> 
> M-: (compare-strings "σ" nil nil "ς" nil nil t)
> 
> ==> -1  ;; should be t

No, because these characters are not a case pair.

> 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"?