updated property
Updated is when the thing last MOVED, as RFC 3339 in UTC: a repository's last push, or a site's last deploy. The page is ordered on it, most recent first, by comparing these strings — so the format is load-bearing and not cosmetic. Absent means the source reported no timestamp, and such a row sorts last.
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? updated;