FA-4528 / Listener lifecycle / Member archive

Once listener removed before action · case 03

The operation returns a result or retained state that violates this contract: Listeners have identity, event name, once flag, and registration order. Dispatch uses a snapshot; listener actions remove another listener or add a new one. Return callback identities in invocation order. A once listener is removed before callback actions; a callback may explicitly re-register that identity.

Member previewVariant 3 · 3 implementations · 5 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
snapshot removal and once lifetime	`["a", "b", "c", "a", "c", ["a", "c"]]`	`["a", "b", "c", "c", ["c"]]`	Failed

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