Re: [whatwg/streams] alert underlyingSink when [[strategySize]]() fails (#628)

It's worth noting that for TransformStreams, the strategy author and the sink author aren't the same.

Even if you try to wrap `strategy.size()` inside another `size()` that does try-catch and rethrows the error, it, unlike with `write()`, also has to duplicate the error checking in `EnqueueValueWithSize`, in which case the `RangeError` it produces on its own won't be equal to the `RangeError` thrown by `EnqueueValueWithSize`.

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