FA-45920 / Bounded deques / Member archive

Shrink uses new capacity as the eviction count · case 05

Shrink uses new capacity as the eviction count.

Member previewVariant 5 · 3 implementations · 6 checks per implementation

Case contract

Shrink an occupied logical deque to a smaller bound, retaining the newest suffix. Return retained values, evicted prefix, a linear backing allocation, and free capacity.

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
zero bound	`[[5, 6], [], [5, 6], -2]`	`[[], [5, 6], [], 0]`	Failed

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