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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: [PATCH 3/3] Inherit process output coding system to stderr
	process.
Date: Sun, 08 Apr 2018 19:39:40 +0300
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> Date: Sun, 08 Apr 2018 16:18:10 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: phst@google.com, emacs-devel@gnu.org
> 
> > Is it possible to write raw bytes to the standard output/error streams using Emacs?
> 
> Yes, use raw-text or no-conversion as the encoding (the former allows
> to produce DOS and Mac EOLs, the latter doesn't).

Just in case it is relevant and helpful: the function insert-byte
could help you insert arbitrary raw bytes into a buffer.