I haven't used Janet but there were some notes in the author's ebook (https://janet.guide/ https://janet.guide/) that suggested it had some small but key differ

I haven't used Janet but there were some notes in the author's ebook (https://janet.guide/ https://janet.guide/) that suggested it had some small but key differences with a more "traditional" Lisp that might trip you up or at least cause friction. I'd suggest using Racket for those books.