Oh man. I had a coworker once who would frequently commit with a single word commit "fixup" - often as you'd expect at the end of a PR but never squashed or put anymore detail into what they actually did, often much more than simple whitespace or linting changes you'd expect from the message, so you had to be really careful to check. If you then searched the commit history for "fixup" 100s of commits would show up. The person in question had so many other issues working in this team that this particular one was never brought up but it drove me mad.