It depresses me when a dev gets nervous about changing code in a project they're involved in. If they're not I'm control, no-one is!
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One cute feature of markdown I'd not noticed before: there's no syntax for images *without* a description (i.e. alt text).
https://spec.commonmark.org/0.31.2/#images
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!
I've been experimenting with an 'evaluate up to cursor' mode for my PL project.
I love evaluating self-contained snippets in Lisp, this generalises the idea.
The interpreter remembers the arguments when you run tests, then can re-use them when you say 'eval up to here'.
What do you think?