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

Thanks @isonmad. I hadn't realised the difference was observable.

However, we can't implement it as adding the numbers every time because of the performance issue. Either we keep a running count or we do something cleverer to deal with the lack of precision issue you mentioned.

For example, we could keep a running count but recalculate it every time removing a chunk results in the number of remaining chunks being a power of two. However, that would be very janky.

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