Comment by hrmtst93837

If you're patching hot paths with C and praying the interface layer doesn't explode, you can spend almost as much time chasing ABI boundary bugs as you save on perf. Type hints in Python are still docs for humans and maybe your LSP. Julia does address the two language problem in theory, but getting your whole stack and your deps to exist there is its own wierd pain, and people underplay how much library inertia matters once you leave numerics.