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

I'm concerned about the spec complexity. `.ready` and `.closed` changed in recent two weeks. Currently they are defined very cleanly, but can we keep the readability when we start caching?

I don't see any reason to keep promise identity on "cancel()" return value.

FYI, as @tyoshino said, we have some difficulties to ensure the identity. Currently I'm not sure if it is worth ensuring.

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