confidence property
Confidence says how much the counters beside it mean — a meter that reported only a percentage leaves them at zero, and this is how a reader tells that from a true zero.
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? confidence;