Re: [whatwg/dom] Variable strength aborting (Issue #1215)

You can attach data to the `Error` class:

```js
const reason = new Error('User clicked Kill Now')
reason.force = true

function aborted (event) {
  if (event.target.reason.force) {
    kill()
  } else {
    cancel()
  }
}
```

Or use two signals:


```js

let shuttingDown = false
process.on('SIGINT', () => {
  if (!shuttingDown) {
    // First interrupt, start graceful shutdown
    shuttingDown = true
    program.closed.then(() => { process.exit() })
    gracefulController.abort()
  } else {
    // Second interrupt, kill everything now
    forcefulController.abort()
  }
})
```


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