Re: [streams] Transform streams and acknowledgement of writes (#329)

A row describing ideal behavior for the `beginWrite()` approach to add to https://github.com/whatwg/streams/issues/329#issuecomment-95052407.

| w \ r | default | BYOB | with-ack |
|----|----|----|----|
| beginWrite | `id` allocates a buffer, fulfills `beginWrite()` with the buffer. Once completed, give it to the consumer | Fulfill `beginWrite()` with the buffer provided to `read(view)`. Fulfill `read(view)` with the buffer returned by the producer | Same as the left most. Ack is ignored |

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https://github.com/whatwg/streams/issues/329#issuecomment-106711552