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

as extra clarification, this is how you should write that

```js
var p1 = new Promise(function (resolve, reject, ifCanceled) {
  var internal = setTimeout(resolve.bind(null, 123), 1000);
  ifCanceled(function () {
    clearInterval(interval);
    console.log('been cancelled');
  });
});
```

How else could you possibly cancel that promise that would like to resolve in a second? That's the way, if you want resolve to happen then don't setup cancel-ability through the `ifCanceled` mechanism.

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