Re: [fetch] Should `body` parameter in the Response constructor nullable? (#178)

I think this case is a bit subtle since `res.body` can return `null` so it's a little strange to disallow passing in `null`.

Another way to think about it is that `undefined` is supposed to be a default-value triggerer. In this case the default value seems to be ... `null`. And it's weird that you can only set the default value implicitly, not explicitly. It would be a different story if `res.body` returned `undefined` for null body, but it doesn't. (And I think that's probably a good thing.)

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