I think the thing would be to determine how to have it formatted to what the user is wanting to see. I can see there being times when the number should not be formatted with proper separators. Such as a phone number being written out as {{AREA}}-{{PREFIX}}-{{LINE}} where LINE would be a 4 digit number that shouldn't have a separator. (Of course this is a poor example as you'd probably want to get this into the app already formatted, this is just for illustration.)

With the helpers, we introduce (in a later PR) a way to have a number or a date formatted easily. The helper does not, however, translate to a formatter for the messages. 

Originally, the thought would be to do something like: 
```
user: {
    firstName: 'Anthony',
    lastName: 'Pipkin',
    numBooks: new Intl.NumberFormat(2000)
}
```
but I could see where that isn't intuitive.