Check out https://codeberg.org/veqq/varray implementing APL primitives on tarray (so should be a magnitude faster than the cffi approach), which powers https://codeberg.org/veqq/declarative-dsls which exposes a fair bit of statistics stuff (I have a financial analysis library built on top of it in prod, which I'll try to open source soon) besides logic features
There is also https://codeberg.org/zzkt/deft/ for typing things.
And spork/sh does sh
I invite you to: https://janet.zulipchat.com/ (n.b. there's a very active chat channel)