Re: [fetch] Header guards (#182)

I'm not sure. The way we sometimes explain this "magic" is that if these objects were solely implemented in JavaScript they would accept a magic token in the constructor somewhere known only to the user agent that would do the right thing. It's not clear you can really polyfill that though. @domenic?

I suspect at some point we should give this constructor a second argument that takes a dictionary that does expose this. And perhaps also expose guard as a getter on the object's prototype. Not sure.

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