FA-11622 / Compression format semantics / Member archive
Delta decompression carries a predictor across independent blocks · case 02
Delta decompression carries a predictor across independent blocks.
Case contract
Each list is an independent delta-coded block whose predictor starts at zero. Return corresponding lists of prefix sums; empty blocks remain empty.
Why this case matters
A small offline codec model isolates a compression-specific failure without external files or libraries.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| reset boundary | [[2, 3], [5, 6]] | [[2, 3], [2, 3]] | Failed |
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