TIL the Ruby interpreter exposes ObjectSpace to normal Ruby code, so you can do things like iterate over all classes
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The Rust documentation host, https://docs.rs/, has a really cute nudge to make sure your code has documentation. It exposes the docs coverage percentage in the UI!
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Renaming code often exposes further needs for refactoring: https://www.fluentcpp.com/2021/04/23/make-bad-code-look-bad/
(I found the example really compelling!)
Commonmark.js has a lovely feature that's rare in markdown renderers: it exposes an AST! https://github.com/commonmark/commonmark.js/#usage
This makes it so much easier to extend/modify the syntax in a robust manner.