handle property
Handle is the display name on the caller's listed row. Empty when they never chose one; opting in without a handle sets it to their username, so a listed row is never blank.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? handle;