confidence property
Confidence is the filer's own confidence in 0,1 — 1 for a processor chargeback, less for an analyst's hunch. Zero is the ordinary value for a filer that stated none, and it means the weakest tie-break there is rather than "unknown". It breaks a tie only WITHIN one precedence rank and can never lift a weak source above a strong 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
num? confidence;