FA-47005 / Bounded deques / Member archive

Lazy reversed deque appends at the wrong physical endpoint · case 05

Lazy reversed deque appends at the wrong physical endpoint.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

A bounded deque stores physical values and a lazy reversed flag. Flip toggles orientation without moving storage; logical append and front-pop select the appropriate physical endpoint. Full append rejects.

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

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