bug#34873: 27.0.50; Creating unibyte string in emacs modules

[Eli Zaretskii]

> From: "Basil L. Contovounesios" <contovob@tcd.ie>
> Cc: <lg.zevlg@gmail.com>,  <34873@debbugs.gnu.org>
> Date: Tue, 07 May 2019 17:55:56 +0100
> 
> Sorry if this is a dumb question, but would the functions
> unibyte-string, string-to-unibyte, string-as-unibyte et al. be of any
> use here?

I'm not sure I follow: how can these functions help writing code in a
module?  A module cannot be written in Lisp, and you cannot call these
functions on a C string, only on a Lisp string.

What am I missing?