Forking from T271757: Fix issues with StopForumSpam's doUpdate function
Doing what is effectively $wanCache->makeGlobalKey( 'sfs:denylist:set' ) seems to result in things silently failing in terms of get/set with relation to the cache
$wanCache->makeGlobalKey( 'sfs-denylist-set' ) works fine
I don't know if this is some key mangling going on, or corruption... But it shouldn't just be failing silently IMHO