For the record, CLJS does count. And the tooling although painful is on par with the one found in JS (webpack). Maybe even a little less painful.

But one problem that ClojureScript avoids by virtue of being a 'hosted language' and not having a spec is having to implement its own numeric tower. Numbers can just be floats and move on.

CL mandates integers. Not just fixnums, like WebASM provides, but bignums. As well as rationals. That is a lot of code your run-time will have to provide.

iirc Whalesong (the Racket to JS implementation) bundled a numeric tower that implemented integers using strings).