Async call-type example

Hello,

Thanks a lot for the library, I recently took time and I managed to make it work with babashka (it is quite easy as babashka has an integrated nrepl-server), you just need to make a process and connect to it with cider.

I was trying to look for example of clomacs-defun with an async function, and I wonder if you had any example of callback function? I triend the identity, but it does not work.

Best regards,
David