FA-46873 / Bounded deques / Member archive

Deque rebalance allocates a new identity for the right block · case 03

Deque rebalance allocates a new identity for the right block.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Redistribute two adjacent deque blocks to a requested left occupancy without changing element order or block identities. Return signed left-to-right transfer count and new directory lengths.

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	`[[3, 4], [5, 6], 3, 9, 1, [[3, 2], [9, 2]]]`	`[[3, 4], [5, 6], 3, 8, 1, [[3, 2], [8, 2]]]`	Failed

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