stale property
Stale is whether it is past that bound. A stale set still answers and says so, because yesterday's list beats none.
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
bool? stale;