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commit messages are optional
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I agree with most of these but there's another missing benefit. A lot of the time my colleagues will be iterating on a PR so commits of "fuck, that didn't work, maybe this" are common.
I like meaningful commit messages. IMO "fixed the thing" is never good enough. I want to know your intent when I'm doing a blame in 18 months time. However, I don't expect anyone's in progress work to be good before it hits main. You don't want those comments in the final merge, but a squash or rebase is an easy way to rectify that.