By default, most things assume that tags are immutable and won't check for updates to a tag. So tags aren't great for things that can expire or otherwise need to be changed.
Huh, is that true? If you push a new version of a tag, Github will ignore it? Or if you 'git fetch', git does not update tags? I would be pretty surprised at either of those.
I agree. It is not the case that "most things ... won't check for updates to a tag," which is what GP claimed and I responded to. Most things do check for updates! Without checking, they could not warn you about / reject updates.
The trick to remember though is that new clones don't have any "update" check, they only see and fetch the latest value. There's no force push audit log for git refs in most git server software, there's just "local and remote refs disagree". That's not really an "update check" from the perspective of "having an update notification or update event".
