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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Replacement for string-as-unibyte-function
Date: Tue, 02 Feb 2021 16:58:39 +0200
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In-Reply-To: <20210201195131.0c6b2a17@gauss> (message from Joe Riel on Mon, 1
 Feb 2021 19:51:31 -0800)
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> Date: Mon, 1 Feb 2021 19:51:31 -0800
> From: Joe Riel <jriel@maplesoft.com>
> CC: <help-gnu-emacs@gnu.org>
> 
> I realized it was unclear after posting.  What is different about the filter
> function if I re-evaluate it and then rerun the program, so that the filter
> function gets called, effectively, for the first time, after the call to 
> make-network-process?   Does the presence of the :coding 'binary option 
> add advise to the filter function?

No, what's important is that the first time the filter function runs
and inserts something into the buffer, the buffer is already unibyte.