Re: [whatwg/streams] add @@asyncIterator to ReadableStreamDefaultReader (#950)

domenic commented on this pull request.



> +  1. Let _iterator_ be ! ObjectCreate(`<a idl>ReadableStreamDefaultReaderAsyncIteratorPrototype</a>`).
+  1. Set _iterator_.[[asyncIteratorReader]] to *this*.
+  1. Set _iterator_.[[preventCancel]] to ! ToBoolean(_preventCancel_).
+  1. Return _iterator_.
+</emu-alg>
+
+<h5 id="default-reader-@@asynciterator" for="ReadableStreamDefaultReader">[@@asyncIterator]()</h5>
+
+<p class="note">
+  The <code>@@asyncIterator</code> method is an alias of {{ReadableStreamDefaultReader/getIterator()}}.
+</p>
+
+The initial value of the <code>@@asyncIterator</code> method is the same function object as the initial value of the
+{{ReadableStreamDefaultReader/getIterator()}} method.
+
+<h3 id="default-reader-asynciterator-prototype" interface

This needs its own [@@asyncIterator]() method that does `return this`.

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