[j-pb]

While I'm a huge fan of immutable persistent datastructures, I don't think that they are a neccesity.

And linked lists with reference counting are really easy to do, and don't have any leaks if you don't allow cons cell abuse. (which would mess with immutablity anyways)

You could also do linear types like carp [0], or you could just do manual memory management.

I feel like most people will call something with macros and s-expressions, a reasonable, if brutalist, lisp.

0: https://github.com/carp-lang/Carp