FA-100062 / Preference pair construction / Member archive

Preference pairs: replayed response IDs create duplicate pairs · case 02

replayed response IDs create duplicate pairs.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Candidates are [id,text,score]. Keep first occurrence per ID, then return [highest_id,lowest_id] by score with lexical ID ties, or None if fewer than two unique IDs.

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
replay same id	`["a2", "a2"]`	`["a2", "b2"]`	Failed

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