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

My opinion to https://github.com/yutakahirano/fetch-with-streams/issues/39 is that we should return null for `.body` when the internal associated body is null. In this case, `.getReader()` call is impossible as `.body` is `null`. This is aligned with the current behavior of `fetch(res)` with null body `res`.

Because of these discussions, I'm changing my mind to support `.getReader()` plan with keeping the current behavior about null body req/res.

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