Just sending this here again, since I realized that my original response to my
own message that was sent to bug-grep@gnu.org probably did not get carried
over into the bug tracker (if it did, apologies for the extra noise):
> Oh whoops, almost forgot to mention the version of grep I'm using:
>
> grep-3.1-8.fc29 on Fedora 29
>
> I've also checked through the source files for Fedora's grep package, and
> confirmed there's no patches getting applied that would modify the behavior
> of
> --exclude and friends.
--
Cheers,
Lyude Paul
