FA-8709 / Notification interfaces / Member archive

Toast queue lifecycle: Equal-message toasts with different identities are collapsed · case 04

Equal-message toasts with different identities are collapsed.

Member previewVariant 4 · 3 implementations · 12 checks per implementation

Case contract

Toast IDs deduplicate additions; equal content may belong to distinct IDs; keep newest within capacity; update/dismiss target one ID; clear removes all.

Why this case matters

A deterministic model of toast queue lifecycle; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
distinct messages equal	`[{"id": "a", "message": "same"}]`	`[{"id": "a", "message": "same"}, {"id": "b", "message": "same"}]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.