FA-46182 / Bounded deques / Member archive

Cancelled deque permits remain charged to free capacity · case 02

Cancelled deque permits remain charged to free capacity.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Bounded deque capacity includes live items and outstanding insertion permits. Grant a new permit only if it fits, then cancel one named permit and report the remaining permits and 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
cancel existing	`[[["b", 1], ["new", 2]], true, 2]`	`[[["b", 1], ["new", 2]], true, 4]`	Failed

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