Re: [whatwg/streams] Possible spec bug with concurrent byob reads (#1170)

Unfortunately, we can't, because the underlying byte source could have *transferred* the BYOB view's buffer:
```javascript
const view = c.byobRequest.view;
worker.postMessage(view, [view.buffer]);
c.close();
```
That's why we have to *wait* until the source (eventually) calls `.respond()` or `.respondWithNewView()`, for example:
```javascript
worker.onmessage = (event) => {
  c.byobRequest.respondWithNewView(event.message.view);
};
```
Only then we regain control over the BYOB view, allowing us to resolve the `read(view)` request(s).

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