Re: [found the culprit]

[Eli Zaretskii]

> From: Stefan Monnier <address@hidden>
> Date: Wed, 14 Nov 2018 13:20:00 -0500
> 
> And indeed Dired's `Z` has been compressing directories to tar.gz and
> uncompressing tar.gz to directories (rather than to tar files) for many
> years now.

Well, for some value of "many": that feature was added 3 years ago, if
my Git-fu is strong enough.