FA-46523 / Bounded deques / Member archive

Copy-on-write clone inherits the old sharing count · case 03

Copy-on-write clone inherits the old sharing count.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Write one logical deque position under copy-on-write. Shared storage is detached, leaving the old view unchanged and decrementing its reference count. Exclusive storage keeps identity. Every write advances the value epoch.

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

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