Strange attempts and backoff Behavior

After months in production I see a strange behavior of `attempts` and `backoff`.

This is my code where I create the jobs using `attempts` and `backoff`.

``` js
queue.create('message_outgoing', data)
.attempts(3)
.backoff({type: 'exponential'})
.removeOnComplete(true)
.save(function(error){
if(error) {
return done(error)
}
done()
})
```

And this is the some jobs in `active` state with strange value of attempts.


Also this is the `attempts` value inside one of the job object.

``` js
"attempts": {
"made": 65,
"remaining": -62,
"max": 3
}
```

Why the attempts made more than the maximum value?

Start by reproducing the behavior with the JavaScript queue snippet and the reported attempts object, then trace how attempts and exponential backoff are updated for active jobs. Done means identifying why made exceeds max and either confirming the intended behavior or correcting it with a regression test.

Written by the indexing model from the issue text.