Re: [fetch] Proposed backward-incompatible change: requiring cloning all requests/responses (#61)

I'm really worried about breaking existing sites, especially if we're going in dataless.

At the very least, we'll need to have `fetch`/`cache.put` etc implicitly clone `Request`s/`Response`s that have an empty body, and show a deprecation warning in the console.

We'll also need to keep `bodyUser` & show a deprecation warning in the console on use.

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