TIL Clojure has #_ which discards the next expression: https://betweentwoparens.com/rich-comment-blocks
It's handy for commenting things out written debugging.
miniblog.
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I'm increasingly doubtful that commit messages should be entirely immutable.
I sometimes find myself editing or commenting on merged pull requests, to help future readers.
Phabricator appended a URL to commit messages, which helped. In principle PR merging could do the same thing.
Find yourself regularly reviewing pull requests just to comment "please update the changelog"? Automate it! https://danger.systems/js/
Unlike a CI tool, this is automating PR commenting.
An ingenious way of adding commenting to a static blog (e.g. Jekyll): a service that opens PRs to add comments to your content! https://staticman.net/