Hi Eli,

Thanks for your comments, I add the ":type 'string" for this new
option, and the manual change is reverted now. New patch is attached.

On Sat, Mar 13, 2021 at 3:37 PM Eli Zaretskii <eliz@gnu.org> wrote:
>
> > Date: Sat, 13 Mar 2021 11:55:48 +0800
> > From:  Lin Sun via "Bug reports for GNU Emacs,
> >  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> >
> > A new user option `dired-compress-files-default-suffix' for
> > controlling the default format for compressing directory.
>
> Thanks, but wouldn't it be better to use symbols instead of strings?
> That way, we could prevent typos easier, and also offer completion for
> setting the option interactively.
>
> Also, doesn't the user manual need to be changed as well?