Re: [whatwg/fetch] Cloned responses should not have immutable headers (#608)

The portion you quoted is about the trailer, not the headers. The headers end up being copied with the same guard as the input. I suspect your concern is with inputs where the guard is "immutable" and therefore the clone being "immutable" too.

If you create a new `Response` object you don't get to set the url list or its type (or trailer, but that's less significant and possibly an oversight). Also, you should be able to do:

> const responseClone = new Response(inputResponse.body, inputResponse);

which means you can do it all synchronously and not have to wait for anything.

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