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Batch cache retrieval loses request order and duplicate positions · case 02

Batch cache retrieval loses request order and duplicate positions.

Member previewVariant 2 · 3 implementations · 4 checks per implementation

Case contract

Return one [key,hit-or-miss,value-or-None] result for every requested key in original order, including repeated keys and cached negative values.

Why this case matters

A deterministic cache state transformation. Inputs are copied or treated as immutable; no remote storage, real clock, or concurrent interleaving is simulated.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
fixture 1	`[["a", "hit", 1], ["b", "hit", 2]]`	`[["b", "hit", 2], ["a", "hit", 1], ["b", "hit", 2]]`	Failed

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