Re: [whatwg/streams] "Set totalSize to totalSize + pair.[[size]]." (#582)

I agree that codifying the shortcut makes the most sense. If people are really concerned about the corner cases, we could add checks to `DequeueValue` and recalculate the cached total size if it becomes negative or is `MAX_SAFE_INTEGER` before subtracting the dequeue'd value's size. I don't think that that's required though, mostly because all implementations will end up behaving in the same way in these situations.

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