Returns the view for writing in to, or null if the BYOB request has already been responded to.
Indicates to the associated readable byte stream that instead of writing into
										view, the underlying byte source is providing a new ArrayBufferView,
									which will be given to the consumer of the readable byte stream.
After this method is called, view will be transferred and no longer modifiable.
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A pull-into request in a ReadableByteStreamController.