Re: [whatwg/streams] Update TransformStream API & misc. fixups (#519)

If I understand correctly, this doesn't enforce any ordering guarantees between the start/transform/flush methods. I would like to have the guarantee that transform() is not called until start()'s Promise resolves (and not at all if it rejects), and flush() is not called until transform()'s Promise resolves.

The reason is that if transform() is called before the Promise returned by start() resolves, then a call to enqueue() by transform() could end up happening before before a call to enqueue() by start(). Similarly with transform() and flush().

It's possible to enforce the ordering within the transformer, but that seems likely to cause a steep learning curve as every developer rediscovers the issue.

I can file a separate issue for this if you like.

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