Re: [ServiceWorker] spec should be more explicit about accessing internal body on opaque Responses (#710)

To me, @wanderview's snippet 1 and snippet 2 having the same behavior makes sense. Setting the response's body to null for a HEAD request in `matchAll()` here seems nothing but the same as what [main fetch](https://fetch.spec.whatwg.org/#concept-main-fetch) step 14 does for a corresponding HEAD request to the network.

> it'd be unsafe if you remove half of the body.

I'm not sure I understand this from the context of our discussion here. Can you share a pointer?

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