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pj
f9512354ed
Collapse noDuplicateTxnPerStep and newTxnChangesBalance into a single per-row property: every newly-appearing ledger row's signed amount must match the ledger balance delta. A double-submit lands two rows whose individual amounts cannot both equal the aggregate delta, so each row fires the property, catching both the row-count and balance-math classes of bug under one semantic invariant.