Merge branch 'bad-commits-impls-3.9.1' into bad-commits-impls

* bad-commits-impls-3.9.1:
  bad_commits: add a more efficient TopicCheck impl
Status Job ID Name Coverage
  External
passed ghostflow-check-master

passed rust-git-checks-rustdash-linux-debug

passed rust-git-checks-rustdash-linux-debug+latest

failed rust-git-checks-rustdash-linux-debug+minver

passed rust-git-checks-rustdash-linux-debug

passed rust-git-checks-rustdash-linux-debug

00:00:19

passed rust-git-checks-rustdash-linux-debug+latest

passed rust-git-checks-rustdash-linux-debug+latest

00:00:17

failed rust-git-checks-rustdash-linux-debug+minver

failed rust-git-checks-rustdash-linux-debug+minver

00:00:02