stream property
Stream is the stream that stored the message — absent when no stream captures the subject and the message went out core (fire-and-forget).
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? stream;