Commit messages now do double duty: log of the changes, but also signing off that you've read and understand the code, are taking responsibility for it under your own name.

The second part is an emerging convention but it's fairly common from what I've seen. IDK maybe no one will be reading or writing code in 18 months but if they are we'll need to separate these two things.

Secondarily but probably more importantly: it's real easy to read something and say "yep I understand that." It's a lot harder to fool yourself when you have to actually write down, with your own brain, what that thing you read does. If you're not doing this you must have incredible discipline elsewhere to make up for it.

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