projectKey property
ProjectKey is the board this item is on: the repository name for a forge issue, the index board's key otherwise. With Number it is the item's address in every other route.
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? projectKey;