Mmm...I might have found another candidate for a JIRA ticket

cljs.user=> (number? NaN)
true

NaN is a numeric value, so that seems right to me (and matches Clojure)

I admit that that’s confusing :)

ok if matches Clojure then I guess we are good, more valuable learning on my side

is it worth having this in the docstring of number?

well, I’d say no

why not?