Re: [whatwg/streams] Specify ReadableStream.[[Transfer]] (#623)

isonmad commented on this pull request.



> +
+<h5 id="rs-internal-method-transfer">\[[Transfer]](<var>targetRealm</var>)</h5>
+
+<emu-alg>
+  1. If ! IsReadableStreamLocked(*this*) is *true*, throw a *TypeError* exception.
+  1. If *this*.[[state]] is `"errored"`, throw a *TypeError* exception.
+  1. Let _controller_ be *this*.[[readableStreamController]].
+  1. If _controller_.[[targetRealm]] is *undefined*, throw a *TypeError* exception.
+  1. Let _that_ be a new instance of <a idl>ReadableStream</a> in _targetRealm_.
+  1. Set _that_.[[state]] to  *this*.[[state]].
+  1. Set _that_.[[disturbed]] to *this*.[[disturbed]].
+  1. Set _controller_.[[controlledReadableStream]] to _that_.
+  1. Set _that_.[[readableStreamController]] to _controller_.
+  1. Let _queue_ be _controller_.[[queue]].
+  1. Repeat for each Record {[[value]], [[size]]} _pair_ that is an element of _queue_,
+    1. Set _pair_.[[value]] to ! <a abstract-op>StructuredClone</a>(_pair_.[[value]], _targetRealm_).

It actually can't at this point, because every `[[value]]` here is already the result of a previous StructuredClone call. The only call to StructuredClone that could throw is at enqueue time.

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