Re: [whatwg/streams] Set [[disturbed]] synchronously in ReadableStreamPipeTo (#1022)

> Isn't it visible if someone does something like
> 
> ```js
> response.body.pipeTo(...)
> console.log(response.bodyUsed);
> ```
> 
> ?

My original thought was that this depends on the implementation of pipeTo (ie. whether or not it does the first read synchronously). But I think you can make the difference detectable in any implementation by doing

```javascript
response.body.pipeTo(new WritableStream({}, { highWaterMark: 0 });
console.log(response.bodyUsed);
```

So actually implementations will have to explicitly apply this change. Or maybe this standard is the wrong place to make this change, and it should go in Fetch instead.

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