FA-46174 / Bounded deques / Member archive

Permit allocator rejects a request that exactly fits · case 04

Permit allocator rejects a request that exactly fits.

Member previewVariant 4 · 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
exact available	`[[["a", 1]], false, 3]`	`[[["a", 1], ["new", 3]], true, 0]`	Failed

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