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Deque compaction retains old arena length as logical length · case 03

Deque compaction retains old arena length as logical length.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Compact a deque node arena using its logical live-ID chain. Preserve chain order, remap nullable stable cursors, return old-to-new relocation map, advance epoch, and identify reclaimed old storage IDs.

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	`[[5, 3, 4], [0, 1, 2], [1, 0, null], {"0": 1, "2": 2, "3": 0}, 3, [1], 4]`	`[[5, 3, 4], [0, 1, 2], [1, 0, null], {"0": 1, "2": 2, "3": 0}, 3, [1], 3]`	Failed

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