I think there should be some mention of type hints / PSR-12 here:

https://docs.moodle.org/dev/Peer_reviewing

I often get picked up on them and miss them in my own reviews. And there is some nuance that I often miss such as asking for them to be added on bug backports where they cannot be done. I'm hesitant to edit the wiki or even suggest wording here because I'm often getting pulled up on it myself