Re: [fetch] Aborting a fetch (#27)

Just wanted to add another piece of information in support of my suggested "controller" object pattern for `fetch()`'s return value: [Revocable Proxy](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/revocable).

`Proxy.revocable(..)` returns an object with two properties, the `proxy` itself and the `revoke()` function. This is exactly analogous to what I'm suggesting should be the return value from an `fetch(..)` call, except instead of `revoke()` we should call it `abort()` or `cancel()`, and instead of `proxy` it's `promise`.

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