Re: [whatwg/webidl] Add `async iterable<T>` type to WebIDL (PR #1397)

> Do we have Web IDL tests in WPT? I don't think so, right?

We do, but they're weird since they test things via APIs that use those features. https://github.com/web-platform-tests/wpt/tree/master/webidl/ecmascript-binding

> I guess no tests specifically for this are relevant.

I think linking to the tests for streams using this feature would be good. Especially if you can verify that everything you introduce in this PR is covered by some aspect of the streams tests. (Which is probably the case since the streams tests are quite thorough, IIRC.)

> Considering this is mostly an editorial refactor, do we even need "implementer interest"? There is nothing to implement until an upstream spec uses this. I'll ask for support anyway though:

Implementer support for Web IDL stuff like this is tricky and requires a judgement call. I think we should CC the bindings teams and give them a chance to weigh in, so @japhet and @yuki3 for Chromium. For example if they were concerned about how to implement this in the bindings layer, or if they were concerned that introducing this feature would be bad because then too many specs might use it and actually it should be rare.

However, since this doesn't require any immediate changes to any implementations, I think we shouldn't block on requiring such support, if we don't hear back.

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