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Updating one cached representation removes sibling variants · case 04

Updating one cached representation removes sibling variants.

Member previewVariant 4 · 3 implementations · 4 checks per implementation

Case contract

Unique entries are [resource,variant,value]. Replace only the exact pair and append its updated representation, preserving every other entry in 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	`[["r", "en", 3]]`	`[["r", "fr", 2], ["r", "en", 3]]`	Failed

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