EmberInputMask does not play well with multiple masks property

Hello!!

In my app I have a field with two kinds of masks:

```hbs

```

The idea is simple, when any of the masks is complete I just want to call a function (covered in inputmask.js) to do some business logic there.

The problem is: The input does not allow more typing after the first mask is complete! I've checked if is a inputmask bug but I think is not, because everything works when I remove `@update` part (of course with bunch of console errors because `@update` is required by the component).

I've tried to reproduce this behaviour in tests right here in this repo, as placed in: https://github.com/brandynbennett/ember-inputmask/issues/144