I've read criticism of musl optimisation here compared to j(e)malloc. Just saying, premature optimisation being bad, not all optimisation is. Might be a future issue to look at.

How small does it go? Is it nix small? Does it compute the minimum bounded set of called routines and eliminate dead code? Does it incur directory structures you can show are never written to and could be rmdir?

Can it run read-only with an mfs overlay?

I like the ethos. Not running as root is nice.