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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: emacs-26 8f18d12: Improve documentation of decoding into a
	unibyte buffer
Date: Mon, 27 May 2019 19:40:12 +0300
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To: Robert Pluim <rpluim@gmail.com>
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In-reply-to: <m2blzo6xfs.fsf@gmail.com> (message from Robert Pluim on Mon, 27
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> From: Robert Pluim <rpluim@gmail.com>
> Cc: Eli Zaretskii <eliz@gnu.org>
> Date: Mon, 27 May 2019 11:47:35 +0200
> 
>     string-as-unibyte is a built-in function in `src/fns.c'.
> 
>     (string-as-unibyte STRING)
> 
>       This function is obsolete since 26.1;
>       use `encode-coding-string'.
>       Probably introduced at or before Emacs version 20.3.
>       This function does not change global state, including the match data.
> 
> Having trawled through the elisp manual, for the life of me itʼs not
> clear which coding system I should use. 'raw-text'? 'us-ascii'?
> Something Else?

You should use utf-8-emacs-unix.