FA-100112 / Preference pair construction / Member archive

Preference pairs: stale annotation revisions remain active · case 02

stale annotation revisions remain active.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Rows are [pair_id,revision,chosen,rejected,valid], with unique revisions per pair. Latest revision wins regardless of validity; emit chosen/rejected only when that latest row is valid, otherwise None. Pair order is first-seen.

Why this case matters

A small deterministic preference-data transform makes pair semantics inspectable without a training framework.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
later reversal	`[["p2", "a", "b"]]`	`[["p2", "b", "a"]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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