Re: [whatwg/streams] Can pipeTo() be synchronous? (Issue #1243)

Another issue:

```js
await Promise.resolve().then(async () => {
  let synchronous = false;
  let readable = new ReadableStream({
    pull() {
      synchronous = true;
    }
  }, { highWaterMark: 0 });
  await new Promise(setTimeout); // make sure the stream is started
  readable.pipeTo(new WritableStream());
  console.log(synchronous);
});
```

This logs true on Gecko/Blink but false on WebKit. Maybe it's more natural to be synchronous here as `getReader().read()` pulls synchronously, except I'm not a fan of synchronous JS call...

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