FA-11632 / Compression format semantics / Member archive
Move-to-front decoder updates the wrong position · case 02
Move-to-front decoder updates the wrong position.
Case contract
Decode valid ranks against a unique-symbol alphabet; emit selected symbol and move it to the front after each selection.
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 |
|---|---|---|---|
| repeat front | "caa" | "ccc" | Failed |
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