Glad that I added some tests as this meant I found a bug in the PR I pulled previously (#12257).
The `thanks_dev` key expects a username in the format `u/gh/USERNAME`, but the call to `basename()` was stripping the `u/gh/` part off.
If the use of `basename()` is preferred here, the alternative would be to add `u/gh/` to the default URL prefix for thanks.dev. Let me know if you me to change that.
2b970652fb