Re: [whatwg/streams] Support transferable streams (postMessage) (#1053)

@ricea commented on this pull request.



> + 1. Perform {{WritableStream}} transfer steps with |value|.\[[writable]] and |writableDataHolder|.
+ 1. Set |dataHolder|.\[[writable]] to |writableDataHolder|.
+
+</div>
+
+<div algorithm="TransformStream transfer receiving steps">
+Their [=transfer-receiving steps=], given |dataHolder| and |value|, are:
+
+ 1. Perform {{ReadableStream}} transfer-receiving steps given |dataHolder|.\[[readable]] and
+    |value|.\[[readable]].
+ 1. Perform {{WritableStream}} transfer-receiving steps given |dataHolder|.\[[writable]] and
+    |value|.\[[writable]].
+
+<p class="note">These steps intentionally leave the \[[backpressure]],
+\[[backpressureChangePromise]] and \[[transformStreamController]] slots uninitialized. They are not
+used in a transferred TransformStream.</p>

I set them to undefined but retained the note that they aren't used.

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