FA-10529 / Caching / Member archive

An L2 hit fails to populate the faster cache tier · case 04

An L2 hit fails to populate the faster cache tier.

Member previewVariant 4 · 3 implementations · 4 checks per implementation

Case contract

On an L1 miss and L2 hit, copy the L2 value into L1. Existing L1 data wins. Return [new-L1,selected value or None]; this model output does not distinguish a terminal miss from a cached None.

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	`[{}, 4]`	`[{"a": 4}, 4]`	Failed

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