2015-10-19 14:22 GMT+01:00 Eli Zaretskii <eliz@gnu.org>:
>
> > and after all it has significantly different semantics anyway
> > (it doesn't quote shell keywords like 'if'), so I will not be using
> > shell-quote-argument.
>
> Please do use shell-quote-argument.  Fixing any problems in
> shell-quote-argument is orthogonal to this package.  Inventing your
> own functions for that is not the right way.
>

Yes, please do use it.
Elpa is part of Emacs. Having some feature reimplemented there is like
having the same function implemented twice inside Emacs.
As much as possible, the code on the archive should extend the code
released with the Emacs tarballs, not repeat it.