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

> ```js
> var req = new Request(url, { method: "POST", body: "foo" });
> fetch(req);
> fetch(req);
> cache.add(req);
> ```
>
> fails on the second fetch, since the body is drained.

Does it? https://fetch.spec.whatwg.org/#concept-http-network-or-cache-fetch step 1 seems to perform a clone, or am I misunderstanding? +@annevk

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