version property
Version is this revision's number, 1 for the first. Numbers are dense and never reused: deleting the prompt drops the whole history with 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
int? version;