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An old fetch repopulates a cache after invalidation · case 05

An old fetch repopulates a cache after invalidation.

Member previewVariant 5 · 3 implementations · 4 checks per implementation

Case contract

Publish fetched value only when its captured generation equals the current generation; otherwise preserve the complete cache.

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": "stale"}`	`{}`	Failed

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