Re: [whatwg/streams] Editorial: remove forAuthorCode and use dictionaries for read() return value (#1045)

Looks good to me! 👍 

I especially like the separation between `chunkSteps` and `doneSteps`. I find [the new version](https://github.com/whatwg/streams/blob/6f6a064ec51865d0f7119169a353c2c3b3c00e1b/reference-implementation/lib/ReadableStream-impl.js#L131-L135) of `asyncIteratorNext` to be much more understandable than [the old one](https://github.com/whatwg/streams/blob/c20f174396617787e1176e11796fc5039088a5ab/reference-implementation/lib/ReadableStream-impl.js#L131-L144).

Perhaps we could use a ["struct"](https://infra.spec.whatwg.org/#structs) or a ["tuple"](https://infra.spec.whatwg.org/#tuple) in the spec text to represent all three steps, so we can thread them as a single argument through the various operations? Or would that make the reference implementation too different from the spec text?

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