I’ve been looking for something like this for a while; a nice well thought out interface for async iterators that is simple to integrate into any given event sy

I’ve been looking for something like this for a while; a nice well thought out interface for async iterators that is simple to integrate into any given event system. I quite like the `fromEvent` function and `Subject` class: they should make it really easy to achieve what I’ve been after, without me writing yet another set of boilerplate interfaces around a stream!