Re: [streams] Implement readable stream teeing (b326a6e)

I think if someone messed with Object.prototype.value, this might fail.

The ES spec would probably handle this with some kind of Record (i.e., a spec type that doesn't correspond to a real object). But, I am not sure how to integrate that with promises, which can only hold real objects. Maybe this is related to your GenerateChunk idea, and we need to refactor more.

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