FA-46384 / Bounded deques / Member archive

Block split leaves directory cache generation unchanged · case 04

Block split leaves directory cache generation unchanged.

Member previewVariant 4 · 3 implementations · 6 checks per implementation

Case contract

Split a deque storage block at an interior cut, keeping the original identity on the left and assigning a fresh right identity. Publish an incremented directory epoch and ordered block IDs without changing total element count.

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, 5], [6, 7], 8, 9, 3, 4, [8, 9]]`	`[[4, 5], [6, 7], 8, 9, 4, 4, [8, 9]]`	Failed

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