latencyMs property
LatencyMs is EndTime-StartTime in milliseconds, nil when the trace carries no timing (so the console renders "—", never a fabricated 0).
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
num? latencyMs;