postalCode should be a string not an integer.
    
    postalCode is defined as an Int. This means you can't define one that has
    a leading zero nor can you have dashes, letters, etc.
    
    This changes the data type on the server. It will still accept an int
    value if provided and convert it into a string.
    
    Bump the API version to 2.1.
    
    ticket 1150