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

> I think the exception is being propagated to the right place already

If an error occurs in a transformstream that's part of a pipe chain, is the error not supposed to be propagated both backwards and forwards?

Like I said in the OP, this makes propagating the error forward down the pipe chain from a transformstream impossible, in the current state of things.

```js
const rs = getReadableStream();
const transformed = rs.pipeThrough(new TransformStream({}, new StrategyThatThrows()));
const reader = transformed.getReader();
```
If the intermediate TransformStream's strategy throws, it will propagate backwards and cancel `rs`, but `transformed` will just mysteriously hang and never receive any new chunks, because the writable end of the transformstream is errored and not doing anything anymore.

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