FA-10383 / Caching / Member archive

A cache hit leaves the entry at the eviction end · case 03

A cache hit leaves the entry at the eviction end.

Member previewVariant 3 · 3 implementations · 4 checks per implementation

Case contract

Given unique keys ordered least to most recent, move an existing hit to the end; misses do not alter order.

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", "b", "c"]`	`["b", "c", "a"]`	Failed

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