Re: [fetch] Body.json reviver (#104)

I understand, I was mislead by the polyfill using `JSON.parse()`. Why not extend the concept of reviver to the underlying mechanism? This would permit to instantiate JavaScript object from their JSON representation with some login (e.g. dealing with `Date`s or returning an existing object instance where the JSON was already parsed before).

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https://github.com/whatwg/fetch/issues/104#issuecomment-128027084