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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: search-default-mode char-fold-to-regexp and Greek Extended
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Date: Thu, 25 Jul 2019 05:36:12 +0300
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To: Juri Linkov <juri@linkov.net>
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> From: Juri Linkov <juri@linkov.net>
> Date: Thu, 25 Jul 2019 02:12:01 +0300
> 
> This is an interesting case like (upcase "ß") => "SS" that required
> adding (?ß "ss") to pass the tests.

Isn't there now an upper-case eszet that eliminates that problem?