Re: [whatwg/streams] ReadableStreamDefaultController seems redundant (#743)

> The ReadableStream would not call this callback until some data is first requested. At that time, it can do different things depending on the request:

I've been sketching how to optimize piping with identity streams in the middle at #511. Allowing skipping identities is yes good (#325). This can be realized even in the current design by extending the interfaces for sources/sinks, I think.

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