[leonardool]

Hi! One of the authors of Ribbit here (@leo-ard).

One of our goals was to reduce as much as possible a R4RS compliant REPL, because it is quite reasonably sized and doesn't support macros (we managed to fit it in 6.5KB!). We considered R7RS, but it was a bit too ambitious for a first goal. We plan on supporting R7RS eventually !

If you want to read more, section 4 of "A R4RS Compliant REPL in 7 KB" explains our rationale behind the choice of R4RS :

https://arxiv.org/pdf/2310.13589

[tmaly]

6.5K ! you could fit that on some microcontrollers