FA-47192 / Bounded deques / Member archive

Deque headroom becomes negative above the high watermark · case 02

Deque headroom becomes negative above the high watermark.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Bounded deque pressure notifications are edge-triggered: unpaused producers pause on an upward high crossing; paused producers resume on a downward low crossing. Return state, ordered notification list and distances to both thresholds.

Why this case matters

Controlled bounded deque implementation model with explicit storage and lifecycle observations.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
2	`[false, [], true, false, -1, 4]`	`[false, [], true, false, 0, 4]`	Failed

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