pub fn trailer_with(
state: &StreamState,
surface: &AgentSurface,
target: Option<Map<String, Value>>,
value: Value,
) -> ValueExpand description
Annotates the trailer with the one record for the whole stream.
Deliberately does NOT project, filter or cap. The summary line is the stream
describing itself; a --select aimed at the records has no business either
failing on it or rewriting it, and both of those were measured defects.