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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Some dynamic module questions
Date: Fri, 27 Nov 2020 14:47:52 +0200
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To: Helmut Eller <eller.helmut@gmail.com>
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> From: Helmut Eller <eller.helmut@gmail.com>
> Date: Fri, 27 Nov 2020 13:01:55 +0100
> Cc: Emacs developers <emacs-devel@gnu.org>
> 
> > Emacs 28 will have a make_unibyte_string function. Before that, you
> > have to resort to calling the unibyte-string function directly.
> 
> But that's only for passing bytes from C to Lisp.  What about the other
> direction?

Why do you need that?  The concept of unibyte vs multibyte strings
exists only in Lisp; in C you just have a sequence of 'char' bytes,
and the way you interpret it depends on your C code.

If you have some specific use case where this looks like a necessity,
can you describe that use case?