source_ property
Source is who filed the winning assertion, and it is the PRIMARY term of the rule that picked it. Sources rank by adjudication weight — chargeoff, dispute, case, refund, review, sample, strongest first — and only inside one rank do the tie-breaks run, in order: the assertion that became KNOWABLE latest, then the higher confidence, then the lower id. The vocabulary op publishes that order from the same declaration the resolver reads, so a caller holding a contested answer can reproduce it.
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? source_;