visibility property
Visibility is "public" or "private", and Hidden reports platform moderation. Both are always present (never omitempty) so a consumer can tell a real answer from "this API is too old to say" — and so a console never renders a project as public because a field was missing. Authorship is deliberately absent: it is Org, above.
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? visibility;