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Tag invalidation keeps entries sharing only one requested tag · case 03

Tag invalidation keeps entries sharing only one requested tag.

Member previewVariant 3 · 3 implementations · 4 checks per implementation

Case contract

Entries are [key,tags]. Remove every entry having any tag in the requested set, preserving input order; empty requested tags remove nothing.

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	`[["a", ["red"]], ["b", ["blue"]], ["c", []]]`	`[["b", ["blue"]], ["c", []]]`	Failed

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