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

Wait, isn't there a reason you'd want to spec it as adding up the numbers every time for the case where each size can return an arbitrary Number, if not implement it?

Like if the size starts to exceed `Number.MAX_SAFE_INTEGER`, could subtracting one chunk's size from the total end up not the same result as adding up all remaining chunks again.

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