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FA-34831 / Notification interfaces / Open access

Inbox notification pin persistence: notification-expires from pinned · case 01

The notification-expires event leaves a notification in unpinned instead of expired-pinned.

Verified by executionVariant 1 · 35 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Expiration silently removes an explicit retained pin.

THE FAILURE

Expiration silently removes an explicit retained pin.

Unsuccessful approach: Deleting expired pinned content loses the promised retention marker.

Case contract

Inbox notification pin persistence is a bounded visual-notification workflow with mutable policy state {'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True}. Its default transition relation is {('unpinned', 'pin-click'): 'pin-pending', ('pin-pending', 'pin-success'): 'pinned', ('pin-pending', 'pin-failure'): 'pin-error', ('pinned', 'unpin-click'): 'unpin-pending', ('unpin-pending', 'unpin-success'): 'unpinned', ('unpin-pending', 'unpin-failure'): 'unpin-error', ('pin-error', 'cancel-pin-intent'): 'unpinned', ('unpin-error', 'cancel-unpin-intent'): 'pinned', ('pinned', 'notification-expires'): 'expired-pinned', ('expired-pinned', 'unpin-expired'): 'gone'}; domain inputs can suppress or redirect transitions and update policy fields, as specified in solve. Different-generation events are inert. Batches apply in order. Optional observe returns the selected policy field alongside the phase.

Why this case matters

Visual notification lifecycle ordering can leave an inbox or toast showing the wrong actionable state even when transport succeeds.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(initial, events, generation, payload=None, observe=None):
    table = {('unpinned', 'pin-click'): 'pin-pending', ('pin-pending', 'pin-success'): 'pinned', ('pin-pending', 'pin-failure'): 'pin-error', ('pinned', 'unpin-click'): 'unpin-pending', ('unpin-pending', 'unpin-success'): 'unpinned', ('unpin-pending', 'unpin-failure'): 'unpin-error', ('pin-error', 'cancel-pin-intent'): 'unpinned', ('unpin-error', 'cancel-unpin-intent'): 'pinned', ('pinned', 'notification-expires'): 'unpinned', ('expired-pinned', 'unpin-expired'): 'gone'}
    data = json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})) if payload is None else {**json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})), **json.loads(json.dumps(payload))}
    state = initial
    for delivery in events:
        event, event_generation = delivery[:2]
        arg = delivery[2] if len(delivery) > 2 else {}
        if event_generation == generation:
            previous = state
            if event == 'pin-click' and data['item'] not in data['pinned'] and len(data['pinned']) >= data['capacity']: event = 'unknown-event'
            if event == 'notification-expires': data['expired'] = True
            state = table.get((state, event), state)
            if state in ('pinned','expired-pinned') and data['item'] not in data['pinned']: data['pinned'].append(data['item'])
            if state in ('unpinned','gone'): data['pinned'] = [x for x in data['pinned'] if x != data['item']]
            if state == 'gone': data['retained'] = False
    return {'phase': state, 'value': data[observe]} if observe else state
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('unpinned / pin-click', solve('unpinned', [('pin-click', N)], N), 'pin-pending')
check('pin-pending / pin-success', solve('pin-pending', [('pin-success', N)], N), 'pinned')
check('pin-pending / pin-failure', solve('pin-pending', [('pin-failure', N)], N), 'pin-error')
check('pinned / unpin-click', solve('pinned', [('unpin-click', N)], N), 'unpin-pending')
check('unpin-pending / unpin-success', solve('unpin-pending', [('unpin-success', N)], N), 'unpinned')
check('unpin-pending / unpin-failure', solve('unpin-pending', [('unpin-failure', N)], N), 'unpin-error')
check('pin-error / cancel-pin-intent', solve('pin-error', [('cancel-pin-intent', N)], N), 'unpinned')
check('unpin-error / cancel-unpin-intent', solve('unpin-error', [('cancel-unpin-intent', N)], N), 'pinned')
check('pinned / notification-expires', solve('pinned', [('notification-expires', N)], N), 'expired-pinned')
check('expired-pinned / unpin-expired', solve('expired-pinned', [('unpin-expired', N)], N), 'gone')
check('older notification incarnation', solve('unpinned', [('pin-click', N - 1)], N), 'unpinned')
check('future notification incarnation', solve('unpinned', [('pin-click', N + 1)], N), 'unpinned')
check('unknown event is inert', solve('unpinned', [('unknown-event', N)], N), 'unpinned')
check('empty delivery batch', solve('unpinned', [], N), 'unpinned')
check('N stale deliveries before current delivery', solve('unpinned', [('pin-click', N - 1)] * N + [('pin-click', N)], N), 'pin-pending')
check('trace pin-click then pin-success', solve('unpinned', [('pin-click', N), ('pin-success', N)], N), 'pinned')
check('trace pin-click then pin-failure', solve('unpinned', [('pin-click', N), ('pin-failure', N)], N), 'pin-error')
check('trace pin-success then unpin-click', solve('pin-pending', [('pin-success', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace pin-success then notification-expires', solve('pin-pending', [('pin-success', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace pin-failure then cancel-pin-intent', solve('pin-pending', [('pin-failure', N), ('cancel-pin-intent', N)], N), 'unpinned')
check('trace unpin-click then unpin-success', solve('pinned', [('unpin-click', N), ('unpin-success', N)], N), 'unpinned')
check('trace unpin-click then unpin-failure', solve('pinned', [('unpin-click', N), ('unpin-failure', N)], N), 'unpin-error')
check('trace unpin-success then pin-click', solve('unpin-pending', [('unpin-success', N), ('pin-click', N)], N), 'pin-pending')
check('trace unpin-failure then cancel-unpin-intent', solve('unpin-pending', [('unpin-failure', N), ('cancel-unpin-intent', N)], N), 'pinned')
check('trace cancel-pin-intent then pin-click', solve('pin-error', [('cancel-pin-intent', N), ('pin-click', N)], N), 'pin-pending')
check('trace cancel-unpin-intent then unpin-click', solve('unpin-error', [('cancel-unpin-intent', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace cancel-unpin-intent then notification-expires', solve('unpin-error', [('cancel-unpin-intent', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace notification-expires then unpin-expired', solve('pinned', [('notification-expires', N), ('unpin-expired', N)], N), 'gone')
check('domain state regression 1: pinned', solve('unpinned', [('pin-click', N, {})], N, {'capacity': 1}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 2: pinned', solve('pin-pending', [('pin-success', N, {})], N, {}, 'pinned'), {'phase': 'pinned', 'value': ['other', 'n']})
check('domain state regression 3: pinned', solve('unpin-pending', [('unpin-success', N, {})], N, {'pinned': ['n', 'other']}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 4: retained', solve('pinned', [('notification-expires', N, {})], N, {'pinned': ['n']}, 'retained'), {'phase': 'expired-pinned', 'value': True})
check('domain state regression 5: pinned', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n', 'other'], 'expired': True}, 'pinned'), {'phase': 'gone', 'value': ['other']})
check('domain state regression 6: retained', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n'], 'expired': True}, 'retained'), {'phase': 'gone', 'value': False})
check('domain state regression 7: pinned', solve('unpinned', [('pin-click', N, {}), ('pin-success', N, {}), ('notification-expires', N, {}), ('unpin-expired', N, {})], N, {}, 'pinned'), {'phase': 'gone', 'value': ['other']})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
unpinned / pin-clickpin-pendingpin-pendingPassed
pin-pending / pin-successpinnedpinnedPassed
pin-pending / pin-failurepin-errorpin-errorPassed
pinned / unpin-clickunpin-pendingunpin-pendingPassed
unpin-pending / unpin-successunpinnedunpinnedPassed
unpin-pending / unpin-failureunpin-errorunpin-errorPassed
pin-error / cancel-pin-intentunpinnedunpinnedPassed
unpin-error / cancel-unpin-intentpinnedpinnedPassed
pinned / notification-expiresunpinnedexpired-pinnedFailed
expired-pinned / unpin-expiredgonegonePassed
older notification incarnationunpinnedunpinnedPassed
future notification incarnationunpinnedunpinnedPassed
unknown event is inertunpinnedunpinnedPassed
empty delivery batchunpinnedunpinnedPassed
N stale deliveries before current deliverypin-pendingpin-pendingPassed
trace pin-click then pin-successpinnedpinnedPassed
trace pin-click then pin-failurepin-errorpin-errorPassed
trace pin-success then unpin-clickunpin-pendingunpin-pendingPassed
trace pin-success then notification-expiresunpinnedexpired-pinnedFailed
trace pin-failure then cancel-pin-intentunpinnedunpinnedPassed
trace unpin-click then unpin-successunpinnedunpinnedPassed
trace unpin-click then unpin-failureunpin-errorunpin-errorPassed
trace unpin-success then pin-clickpin-pendingpin-pendingPassed
trace unpin-failure then cancel-unpin-intentpinnedpinnedPassed
trace cancel-pin-intent then pin-clickpin-pendingpin-pendingPassed
trace cancel-unpin-intent then unpin-clickunpin-pendingunpin-pendingPassed
trace cancel-unpin-intent then notification-expiresunpinnedexpired-pinnedFailed
trace notification-expires then unpin-expiredunpinnedgoneFailed
domain state regression 1: pinned{'phase': 'unpinned', 'value': ['other']}{'phase': 'unpinned', 'value': ['other']}Passed
domain state regression 2: pinned{'phase': 'pinned', 'value': ['other', 'n']}{'phase': 'pinned', 'value': ['other', 'n']}Passed
domain state regression 3: pinned{'phase': 'unpinned', 'value': ['other']}{'phase': 'unpinned', 'value': ['other']}Passed
domain state regression 4: retained{'phase': 'unpinned', 'value': True}{'phase': 'expired-pinned', 'value': True}Failed
domain state regression 5: pinned{'phase': 'gone', 'value': ['other']}{'phase': 'gone', 'value': ['other']}Passed
domain state regression 6: retained{'phase': 'gone', 'value': False}{'phase': 'gone', 'value': False}Passed
domain state regression 7: pinned{'phase': 'unpinned', 'value': ['other']}{'phase': 'gone', 'value': ['other']}Failed

SHA-256 / 8fc7af81e1f41b66c56eaf0b3ec54e0f1f918dd5d341d00da8ef8cbc8e1f2179

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(initial, events, generation, payload=None, observe=None):
    table = {('unpinned', 'pin-click'): 'pin-pending', ('pin-pending', 'pin-success'): 'pinned', ('pin-pending', 'pin-failure'): 'pin-error', ('pinned', 'unpin-click'): 'unpin-pending', ('unpin-pending', 'unpin-success'): 'unpinned', ('unpin-pending', 'unpin-failure'): 'unpin-error', ('pin-error', 'cancel-pin-intent'): 'unpinned', ('unpin-error', 'cancel-unpin-intent'): 'pinned', ('pinned', 'notification-expires'): 'gone', ('expired-pinned', 'unpin-expired'): 'gone'}
    data = json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})) if payload is None else {**json.loads(json.dumps({'pinned': ['other'], 'item': 'n', 'capacity': 3, 'expired': False, 'retained': True})), **json.loads(json.dumps(payload))}
    state = initial
    for delivery in events:
        event, event_generation = delivery[:2]
        arg = delivery[2] if len(delivery) > 2 else {}
        if event_generation == generation:
            previous = state
            if event == 'pin-click' and data['item'] not in data['pinned'] and len(data['pinned']) >= data['capacity']: event = 'unknown-event'
            if event == 'notification-expires': data['expired'] = True
            state = table.get((state, event), state)
            if state in ('pinned','expired-pinned') and data['item'] not in data['pinned']: data['pinned'].append(data['item'])
            if state in ('unpinned','gone'): data['pinned'] = [x for x in data['pinned'] if x != data['item']]
            if state == 'gone': data['retained'] = False
    return {'phase': state, 'value': data[observe]} if observe else state
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('unpinned / pin-click', solve('unpinned', [('pin-click', N)], N), 'pin-pending')
check('pin-pending / pin-success', solve('pin-pending', [('pin-success', N)], N), 'pinned')
check('pin-pending / pin-failure', solve('pin-pending', [('pin-failure', N)], N), 'pin-error')
check('pinned / unpin-click', solve('pinned', [('unpin-click', N)], N), 'unpin-pending')
check('unpin-pending / unpin-success', solve('unpin-pending', [('unpin-success', N)], N), 'unpinned')
check('unpin-pending / unpin-failure', solve('unpin-pending', [('unpin-failure', N)], N), 'unpin-error')
check('pin-error / cancel-pin-intent', solve('pin-error', [('cancel-pin-intent', N)], N), 'unpinned')
check('unpin-error / cancel-unpin-intent', solve('unpin-error', [('cancel-unpin-intent', N)], N), 'pinned')
check('pinned / notification-expires', solve('pinned', [('notification-expires', N)], N), 'expired-pinned')
check('expired-pinned / unpin-expired', solve('expired-pinned', [('unpin-expired', N)], N), 'gone')
check('older notification incarnation', solve('unpinned', [('pin-click', N - 1)], N), 'unpinned')
check('future notification incarnation', solve('unpinned', [('pin-click', N + 1)], N), 'unpinned')
check('unknown event is inert', solve('unpinned', [('unknown-event', N)], N), 'unpinned')
check('empty delivery batch', solve('unpinned', [], N), 'unpinned')
check('N stale deliveries before current delivery', solve('unpinned', [('pin-click', N - 1)] * N + [('pin-click', N)], N), 'pin-pending')
check('trace pin-click then pin-success', solve('unpinned', [('pin-click', N), ('pin-success', N)], N), 'pinned')
check('trace pin-click then pin-failure', solve('unpinned', [('pin-click', N), ('pin-failure', N)], N), 'pin-error')
check('trace pin-success then unpin-click', solve('pin-pending', [('pin-success', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace pin-success then notification-expires', solve('pin-pending', [('pin-success', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace pin-failure then cancel-pin-intent', solve('pin-pending', [('pin-failure', N), ('cancel-pin-intent', N)], N), 'unpinned')
check('trace unpin-click then unpin-success', solve('pinned', [('unpin-click', N), ('unpin-success', N)], N), 'unpinned')
check('trace unpin-click then unpin-failure', solve('pinned', [('unpin-click', N), ('unpin-failure', N)], N), 'unpin-error')
check('trace unpin-success then pin-click', solve('unpin-pending', [('unpin-success', N), ('pin-click', N)], N), 'pin-pending')
check('trace unpin-failure then cancel-unpin-intent', solve('unpin-pending', [('unpin-failure', N), ('cancel-unpin-intent', N)], N), 'pinned')
check('trace cancel-pin-intent then pin-click', solve('pin-error', [('cancel-pin-intent', N), ('pin-click', N)], N), 'pin-pending')
check('trace cancel-unpin-intent then unpin-click', solve('unpin-error', [('cancel-unpin-intent', N), ('unpin-click', N)], N), 'unpin-pending')
check('trace cancel-unpin-intent then notification-expires', solve('unpin-error', [('cancel-unpin-intent', N), ('notification-expires', N)], N), 'expired-pinned')
check('trace notification-expires then unpin-expired', solve('pinned', [('notification-expires', N), ('unpin-expired', N)], N), 'gone')
check('domain state regression 1: pinned', solve('unpinned', [('pin-click', N, {})], N, {'capacity': 1}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 2: pinned', solve('pin-pending', [('pin-success', N, {})], N, {}, 'pinned'), {'phase': 'pinned', 'value': ['other', 'n']})
check('domain state regression 3: pinned', solve('unpin-pending', [('unpin-success', N, {})], N, {'pinned': ['n', 'other']}, 'pinned'), {'phase': 'unpinned', 'value': ['other']})
check('domain state regression 4: retained', solve('pinned', [('notification-expires', N, {})], N, {'pinned': ['n']}, 'retained'), {'phase': 'expired-pinned', 'value': True})
check('domain state regression 5: pinned', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n', 'other'], 'expired': True}, 'pinned'), {'phase': 'gone', 'value': ['other']})
check('domain state regression 6: retained', solve('expired-pinned', [('unpin-expired', N, {})], N, {'pinned': ['n'], 'expired': True}, 'retained'), {'phase': 'gone', 'value': False})
check('domain state regression 7: pinned', solve('unpinned', [('pin-click', N, {}), ('pin-success', N, {}), ('notification-expires', N, {}), ('unpin-expired', N, {})], N, {}, 'pinned'), {'phase': 'gone', 'value': ['other']})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
unpinned / pin-clickpin-pendingpin-pendingPassed
pin-pending / pin-successpinnedpinnedPassed
pin-pending / pin-failurepin-errorpin-errorPassed
pinned / unpin-clickunpin-pendingunpin-pendingPassed
unpin-pending / unpin-successunpinnedunpinnedPassed
unpin-pending / unpin-failureunpin-errorunpin-errorPassed
pin-error / cancel-pin-intentunpinnedunpinnedPassed
unpin-error / cancel-unpin-intentpinnedpinnedPassed
pinned / notification-expiresgoneexpired-pinnedFailed
expired-pinned / unpin-expiredgonegonePassed
older notification incarnationunpinnedunpinnedPassed
future notification incarnationunpinnedunpinnedPassed
unknown event is inertunpinnedunpinnedPassed
empty delivery batchunpinnedunpinnedPassed
N stale deliveries before current deliverypin-pendingpin-pendingPassed
trace pin-click then pin-successpinnedpinnedPassed
trace pin-click then pin-failurepin-errorpin-errorPassed
trace pin-success then unpin-clickunpin-pendingunpin-pendingPassed
trace pin-success then notification-expiresgoneexpired-pinnedFailed
trace pin-failure then cancel-pin-intentunpinnedunpinnedPassed
trace unpin-click then unpin-successunpinnedunpinnedPassed
trace unpin-click then unpin-failureunpin-errorunpin-errorPassed
trace unpin-success then pin-clickpin-pendingpin-pendingPassed
trace unpin-failure then cancel-unpin-intentpinnedpinnedPassed
trace cancel-pin-intent then pin-clickpin-pendingpin-pendingPassed
trace cancel-unpin-intent then unpin-clickunpin-pendingunpin-pendingPassed
trace cancel-unpin-intent then notification-expiresgoneexpired-pinnedFailed
trace notification-expires then unpin-expiredgonegonePassed
domain state regression 1: pinned{'phase': 'unpinned', 'value': ['other']}{'phase': 'unpinned', 'value': ['other']}Passed
domain state regression 2: pinned{'phase': 'pinned', 'value': ['other', 'n']}{'phase': 'pinned', 'value': ['other', 'n']}Passed
domain state regression 3: pinned{'phase': 'unpinned', 'value': ['other']}{'phase': 'unpinned', 'value': ['other']}Passed
domain state regression 4: retained{'phase': 'gone', 'value': False}{'phase': 'expired-pinned', 'value': True}Failed
domain state regression 5: pinned{'phase': 'gone', 'value': ['other']}{'phase': 'gone', 'value': ['other']}Passed
domain state regression 6: retained{'phase': 'gone', 'value': False}{'phase': 'gone', 'value': False}Passed
domain state regression 7: pinned{'phase': 'gone', 'value': ['other']}{'phase': 'gone', 'value': ['other']}Passed

SHA-256 / 2cdf1e8d3a40a4597e0a46d27bac6e283184dc1144669909df9c8e2fa3c6eace

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 35 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

Stipulated single-notification state and policy model only. Event delivery and acknowledgements are explicit test inputs. No DOM, accessibility announcements, live timers, networking, actual rendering, or production-platform conformance is simulated. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:42:35.757403+00:00.

Case digest / 0a78a2a3768d1762eaea388ad9e730f4ecdd3fc1e0380de9e73fb0266725c1d4