Add a spec generator for some?

Clojure has a spec generator for the core some? predicate:

But ClojureScript is lacking this:

Implementation guidance:

Here is the generator in Clojure:

https://github.com/clojure/spec.alpha/blob/2329bb2d869ce59d92a401082587cc82edfce95a/src/main/clojure/clojure/spec/gen/alpha.clj#L136

This would be added to ClojureScript around here:

https://github.com/clojure/clojurescript/blob/6353a9b381144d6d0caa621322af9587922e7c07/src/main/cljs/cljs/spec/gen/alpha.cljs#L92