Re: [streams] Requirement on promises equality (#266)

Re: equality,

See this comment https://github.com/whatwg/streams/pull/296#issue-60790220 of PR #296.

If we decide to put `.closed` back to the stream (not reader) in the future, we need to remember this.

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Re: cancel() on errored/closed stream (https://github.com/whatwg/streams/issues/266#issuecomment-73716393),

- returns a resolved promise when in closed state
- returns a rejected promise when in errored state

As we no longer have any method to probe the current state of the stream synchronously, we should just expect `cancel()` being called when in closed or errored state. I think the current implementation is reasonable for the new async read() style readable stream/reader.

https://github.com/whatwg/streams/issues/266#issuecomment-73716393

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