Re: [whatwg/fetch] fetch assumes a url's object is always a Blob (#457)

So
```js
stream = new MediaStream();
streamURL = URL.createObjectURL(stream);
fetch(streamURL);
```
does indeed result in a `TypeError` in Chrome and Firefox (same for `MediaSource`), but what can _streamURL_ be used for then? If you cannot fetch it, why support it to begin with?

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