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Eviction discards a dirty value without writing it back · case 03

Eviction discards a dirty value without writing it back.

Member previewVariant 3 · 3 implementations · 4 checks per implementation

Case contract

Unique entries are [key,value,dirty]. Remove victim and return [remaining,writeback records]; emit [key,value] only for a dirty resident victim.

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	`[[["b", 4, false]], []]`	`[[["b", 4, false]], [["a", 3]]]`	Failed

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