FA-12874 / Numerical aggregation / Member archive
Absolute deviation about anchor: The anchor is subtracted once from the total instead of once per observation. · case 04
The reduction disagrees with its explicit aggregation oracle.
Case contract
Return sum(abs(x-anchor)); empty input returns zero. Anchor is supplied, not estimated.
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 1 | 10 | 8 | Failed |
MEMBER ARCHIVE
The complete case is available to members.
This record includes three runnable implementations, regression fixtures, execution results, and source hashes.
Member access is invitation-based. Sign in with your invited account to inspect the sources.
Sign in to the archive ↗