contact.email = "x@x.com"

##</code><code>##

    $contact->{'email'} = "x@x.com";

##</code><code>##

    $contact->email("x@x.com");

##</code><code>##

    # module code
    sub email   : Property;

    # ...

    # user code
    $contact->email = "x@x.com";

##</code><code>##

    # module code
    sub email {
        # do some validation or processing here
    }

    # ...

    # user code - API stays the same.
    $contact->email = "x@x.com";