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Gracefully closed deque accepts new producer values · case 03

Gracefully closed deque accepts new producer values.

Member previewVariant 3 · 3 implementations · 9 checks per implementation

Case contract

Graceful close forbids future insertion but permits draining buffered values. Empty closed deque reports closed rather than empty. Terminal consumer waiters wake exactly on first empty close or final drain.

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
3	`[[3, 4], true, null, [], true]`	`[[3], true, null, [], false]`	Failed

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