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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
 block characters
Date: Thu, 25 Jul 2019 15:53:34 +0300
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To: Robert Pluim <rpluim@gmail.com>
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> From: Robert Pluim <rpluim@gmail.com>
> Cc: Juri Linkov <juri@linkov.net>,  emacs-devel@gnu.org
> Date: Thu, 25 Jul 2019 10:59:39 +0200
> 
>     Eli> Isn't there now an upper-case eszet that eliminates that problem?
> 
> There is, but the mapping is one-way.

Right you are, thanks.

> Perhaps this is different in a later version of Unicode than what
> weʼre using.

We are using the latest official version 12.0 of Unicode.  And this
data is unchanged in the current draft for Unicode 13.0, so I think we
are good.