Re: [fetch] "Set internalResponse's url list to a copy of request's url list." (#82)

With this happening just before returning everything makes sense. You can tell a response was synthetic since it's url list is empty, but also because it's type is different.

The only thing that's remaining is that the response from the service worker that's transfered to the document no longer has the same backing object (it's url list will be changed again). This could be fixed once we have proper object transfers and merge `Response` and response somehow.

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