The data for the handle.
- iOS 10.0+
- Mac Catalyst 13.0+
- watchOS 3.2+
The contents of this property are determined by the value of the
type property. For example, when the handle specifies an email address, this property should contain a string similar to “email@example.com” describing the user’s email address. This information may be displayed to the user to help resolve the identity of the intended person.