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So I'm trying to do something a bit tricky. I want to send a message on a Channel to another coroutine, and then wait for a response. However if the response is sent before the sender starts listening, the message will be dropped. So I can't really send the message first and then start listening, as the other coroutine could reply first (race condition).

With standard coroutines I'd likely do something like:
```
val deferredReply = async { startListening(replyChannel) }
sendChannel.send(message)
val reply = defferedReply.await()
```

What would be the idomatic way to do this with Arrow? Is it asyncF I'm looking for?

<https://twitter.com/TheFpTower/status/1182652997853204480>

eager (hot) vs lazy (cold), explained in a funny tweet :smile:

Because async is eager these ordering problems are possible