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Replacing an entry double-counts its existing cache weight · case 03

Replacing an entry double-counts its existing cache weight.

Member previewVariant 3 · 3 implementations · 4 checks per implementation

Case contract

Return total cache weight after inserting or replacing key with nonnegative weight in a unique key-to-weight mapping.

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	`13`	`9`	Failed

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