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Modifying other people's software
Every once in a while, we all feel the need to modify something that someone else built.
You pick some foundation (usually just main), make your feature branch, send it through review, maybe backport it to a few older versions, and then it just... becomes part of the project's history. Jujutsu(jj) is a pretty new version control system, whose main claim to fame is making it easier to change your history. It's honestly kind of addictive, suddenly being able to easily just.. make the small tweaks I want, without having to worry about the overhead of a full-fat fork.
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