FA-47080 / Bounded deques / Member archive

Ring gap insertion omits the first suffix element · case 05

Ring gap insertion omits the first suffix element.

Member previewVariant 5 · 3 implementations · 7 checks per implementation

Case contract

Insert into a valid logical gap by moving the shorter ring side, preferring the right side on equal cost. Left shifts decrement physical head; reconstruct live arc and clear all vacant slots. Full ring rejects atomically.

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	`[[8, 7, null, null, 5], 4, 4, true, 1]`	`[[8, 6, 7, null, 5], 4, 4, true, 1]`	Failed

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