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

Is there a summary of the issues caused by the current model? Or is it just confusion over which apis read response bodies?

If `getReader()` sets the flag, `fetch` would effectively call `getReader()` to get the response body. `put(request, response)` could call `getReader()` of the response, but not the request as bodies are ignored. `cache.match(request)` wouldn't set the flag because body is not needed in the matching process - still trying to get my head around why this is so bad.

Assuming there's huge benefit to making this change, I want it to be possible to ship it in a way that doesn't insta-break existing sites. I guess this means allowing `.put(req, res)` to work even if `req` is used, flagging that in the console, and maybe even recording this so we can reach out to high traffic sites ahead of going strict with `.put`.

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https://github.com/whatwg/fetch/issues/61#issuecomment-114914738