I still can't decide whether M-x ielm fits into an optimal elisp workflow.
The 'strict Emacs' view is that it's better to use buffers for everything, so you can edit and build up expressions there.
The 'tailored UI' view is that ielm is better, because it's a dedicated REPL.
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I've been experimenting with LLM autoresearch. I prompted Sol to make difftastic faster without changing output on the test suite, and log everything it tried:
https://github.com/Wilfred/difftastic/blob/c6e9c6fed4c71276a8b0e377c92695c3d929dc7f/PERF_RESEARCH_LOG.md
It found some interesting performance tweaks, although it's too tolerant of complexity.
Today I learnt that a continually blinking caps lock on Linux signifies a kernel panic: https://unix.stackexchange.com/questions/3840/the-caps-lock-and-scroll-lock-lights-are-flashing-and-everything-is-frozen
(On the plus side, it's the first time I've encountered this despite using Linux for years.)
Tried `just` (the task runner) today, and I really like it. npm has scripts, but `just` works anywhere.
Editor integration is also excellent: you can get by with Makefile highlighting, but in Emacs you can even run everything interactively!
https://github.com/casey/just