[cat_adorer]

I'd like a systems programming lisp with first-class functions, lexical scoping, and tail recursion optimization: lisps are beautiful and there don't seem to be any well suited for handling binary data.

[PeterWhittaker]

Javascript under Safari?

Javascript supports first class functions, lexical scoping, and tail recursion.

AFAICT from stackoverflow, the Safari JS engine optimizes tail recursion, while Firefox is apparently working on it.

[nemoniac]

I think scsh checks all your boxes.

https://scsh.net/