cloneUrl property
CloneURL is the fork's https git remote. GitHub populates a new fork in the background, so a clone issued the moment this answers can still find it empty.
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? cloneUrl;