createdAt property
CreatedAt is when the turn was recorded, RFC 3339 in UTC to the second. Seconds are coarse enough that two turns can share one, which is why Seq and not this is the order.
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? createdAt;