inconclusive property
Why this scenario was not compared, when it was replayed and one side did not produce a result: the harness gave up on it, or its outcome did not reproduce when it was replayed again. One sentence naming the side, what happened and what to do about it.
Null for every scenario that was compared, and for one that never had to be. A slow host may make a run inconclusive; it must never make it different — this is where the first half of that is written down.
Implementation
final String? inconclusive;