status property
Status is the session's own: running, paused, done or error. A build can be read while it is still being written, so this is not always terminal — and an error build is still a readable story, not a missing page.
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? status;