Issue with numericInput plus update function

Encountering an issue where you can't enter all the characters into a field without having to move the cursor around. With this example I can only enter the first 4 characters, then to enter the rest I have the move the cursor to the left.

Here's my input mask using ember's built in `mut` action which has the issue:
```html

```
So as an example, the above InputMask only lets you input 1-234 before it gets stuck. This issue only happens with `numericInput=true`, if it's false, it seems to work OK.

Getting rid of `@update` and `@value` removes the issue, but of course now the value doesn't save when you submit the form.
```html

```

Any ideas what might be going on here?

Thanks.