[whatwg/fetch] What is expected effect of setting Request type and destination? For example, to "audio"? (#555)

What is expected effect of setting `Request` [`type`](https://fetch.spec.whatwg.org/#concept-request-type) and [`destination`](https://fetch.spec.whatwg.org/#concept-request-destination)? For example, to `"audio"` when requesting an audio resource? 

[5.3. Request class](https://fetch.spec.whatwg.org/#request-class)
```
..
  readonly attribute RequestType type;
  readonly attribute RequestDestination destination;
..
```

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