asOf property
AsOf is the instant this answer was taken at, RFC 3339: the one asked for, or the server's clock when none was.
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? asOf;