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Replacing entry tags leaves obsolete reverse-index membership · case 04

Replacing entry tags leaves obsolete reverse-index membership.

Member previewVariant 4 · 3 implementations · 4 checks per implementation

Case contract

Return tag-to-sorted-unique-keys index after replacing one key tags; drop empty buckets and preserve associations belonging to other keys.

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	`{"new": ["a"], "old": ["a"], "shared": ["a", "b"]}`	`{"new": ["a"], "shared": ["b"]}`	Failed

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