FA-4808 / Heap invariants / Member archive

Heappushpop can return new smallest · case 03

The operation returns a result or retained state that violates this contract: Push then pop returns the smaller of the new value and previous heap minimum, retaining the other; empty heap returns the new value and remains empty.

Member previewVariant 3 · 3 implementations · 4 checks per implementation

Case scope

A controlled failure with recorded boundary checks.

Why this case matters

A controlled local-runtime regression for collection APIs, language semantics, or ownership wrappers. Fixtures include boundary and interaction cases.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
new smallest immediately returned	`["b", ["a", "c"]]`	`["a", ["b", "c"]]`	Failed

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