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Deque retirement reports free capacity before returning its slot · case 04

Deque retirement reports free capacity before returning its slot.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Retire one occupied deque slot. Clear its payload, advance that slot generation, append its index to the free list, decrement live count and invalidate the retired [index,generation] handle.

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
0	`[[4, null, null], [2, 5, 0], [2, 1], 1, [1, 4], false, 1]`	`[[4, null, null], [2, 5, 0], [2, 1], 1, [1, 4], false, 2]`	Failed

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

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