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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 19:43:40 +0300
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To: Robert Pluim <rpluim@gmail.com>
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> From: Robert Pluim <rpluim@gmail.com>
> Date: Mon, 27 May 2019 15:02:42 +0200
> Cc: emacs-devel@gnu.org
> 
> If I take a string of say "β", and replace string-as-unibyte with
> (encode-coding-string 'emacs-internal), `encoded-string-description'
> prints "#xCE #xB2", which is the correct UTF-8 encoded
> value.

emacs-internal produces the internal representation, which is a
superset of UTF-8.  It doesn't produce a 100% valid UTF-8.  That's an
important distinction that should be always kept in mind.