I'm in the habit of just adding these things directly to .gitignore for repos which I'm a core contributor to.
Things like:
drafts/
backup/
*.bak
ignored/
etc.I don't really see the downside to just adding them to the tracked gitignore. If other people have a different convention and want to add these files/paths for some reason, it's easily discoverable to them why the files can't be added, and then we can have a discussion about what naming conventions we want.