FA-12923 / Numerical aggregation / Member archive
Capped prefix balance: Negative intermediate debt survives the lower saturation bound. · case 03
The reduction disagrees with its explicit aggregation oracle.
Case contract
Starting at zero, apply each signed delta and clamp the running balance into [0,cap] after every event. cap is positive.
Why this case matters
Exact bounded examples isolate a reduction defect without floating-point or external-service effects.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| regression 2 | -1 | 3 | Failed |
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