Re: [whatwg/streams] Rewrite to use Web IDL, and generally modernize (#1035)

@domenic commented on this pull request.



> @@ -892,7 +896,70 @@ option. If {{UnderlyingSource/type}} is set to undefined (including via omission
  </div>
 </div>
 
-<!-- TODO async iterator stuff -->
+<h4 id="rs-asynciterator" oldids="rs-asynciterator-prototype,
+default-reader-asynciterator-prototype-internal-slots">Asynchronous iteration</h4>
+
+<dl class="domintro">
+ <dt><code>for await (const <var ignore>chunk</var> of <var ignore>stream</var>) { ... }</code>
+ <dt><code>for await (const <var ignore>chunk</var> of <var ignore>stream</var>.values([{ {{ReadableStreamIteratorOptions/preventCancel}} }])) { ... }</code>

They indicate optionality, not array-ness. I can see how it's confusing though :-/. Maybe in this case at least we could just do `{ preventCancel: true }` to show the two different styles.

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