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Dataset deduplication: deleted record is resurrected by older duplicate · case 02

deleted record is resurrected by older duplicate.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Rows [key,revision,deleted,payload] have unique key/revision pairs and arbitrary order. Return [key,payload] for each key whose newest revision is not deleted, sorted by key.

Why this case matters

This deterministic toy operation makes one dataset equivalence or representative rule explicit.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
newest tombstone removes key	`[["item2", "old"]]`	`[]`	Failed

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