Emacs of the package of the day: goto-chg.el: lets you jump to the last changed place in the buffer. Handy for small changes in big files!
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Are there any package managers that treat changelogs as a first class concept?
I end up looking for a CHANGELOG.md or a CHANGES.txt in the source code repository every time. The lack of standard prevents package hosting services being able to show changes.
Shower thought: using a tool like cargo-semver, could you build a package registry where the uploader never chooses the version number?
E.g. your last release was 5.2025-09-13 and you've just changed a type, so today's release is 6.2025-11-05.
It's really satisfying to use a profiler for the first time on a project. I always find a big performance win with only a small code change.
It's never the code that I expected to be slow, however!