Re: [heycam/webidl] Async iterators (#580)

@mkruisselbrink I'm not sure I understand, so this reply may be trash 😀

> if you want to define a method returning an async iterable you'd have to define a separate interface for that return type, and return that instead? Or would `async_iterable<Something>` also be a valid return type directly?

You'd have to define `Something`, or use an existing type. This isn't a return type, it's more like how iterators are currently defined:

```webidl
interface interface_identifier {
  iterable<value_type>;
};
```

But the prose associated with `iterable` is pretty basic, and I think you'd struggle to write something like fibonacci counter with it (not that it's been a problem as far as I know).

Async iterables are complicated straight away as you need to deal with "in parallel" and task queueing, else there's no point in it being async, so you really need to a way to express how the values are "pulled".

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