stale property
Stale is whether the set is past its freshness bound. A stale set still answers — yesterday's list beats none — and this is how a decision knows it leaned on one.
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;