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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: dired-do-find-regexp failure with latin-1 encoding
Date: Sun, 29 Nov 2020 17:50:36 +0200
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To: Yuri Khan <yuri.v.khan@gmail.com>
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 (message from Yuri Khan on Sun, 29 Nov 2020 22:14:51 +0700)
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> From: Yuri Khan <yuri.v.khan@gmail.com>
> Date: Sun, 29 Nov 2020 22:14:51 +0700
> Cc: Dmitry Gutov <dgutov@yandex.ru>, Stephen Berman <stephen.berman@gmx.net>, 
> 	Emacs developers <emacs-devel@gnu.org>
> 
> On Sun, 29 Nov 2020 at 22:07, Eli Zaretskii <eliz@gnu.org> wrote:
> 
> > We don't.  I still hope to understand why -a was needed in this case.
> 
> The grep manual says it considers files to be binary if it encounters
> byte sequences that are not valid text encoded in the locale’s
> encoding.

Is that what the Grep source says?