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

I think the exception is being propagated to the right place already: to the caller of `write()`, which caused this to happen. (Even if it isn't their fault.) I think that leaves us in the same position as we are for several other errors, which is that it's currently not easy for the underlying source to clean up after them; that's the idea behind adding a `finally()` type construct.

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