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

Consider the following code:
```js
let synchronous;
new ReadableStream({
  pull(controller) {
    synchronous = true;
    controller.enqueue();
    synchronous = false;
  }
}).pipeTo(new WritableStream({
  write() {
    console.log(synchronous);
  }
});
```

1. Is this allowed to print `true`?
2. Should it be allowed to print `true`?
3. Is an implementation which prints `true` web-compatible?

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