Easy to hang the current thread with `(a/<!! (a/map f chs))` when `chs` is empty

Question

This code

(a/<!! (a/map vector []))

will hang the current thread.

Would be nice if there was a check for the empty chs argument to a/map or at least a docstring mention, given how easy it is to fall into this trap by using e.g. filter in place of the [] above.

Answer 1

Logged as https://clojure.atlassian.net/browse/ASYNC-238