FA-46674 / Bounded deques / Member archive

Deque iterator advances by request rather than actual delivery · case 04

Deque iterator advances by request rather than actual delivery.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

A fail-fast deque iterator tracks consumed logical count, captured structural epoch and traversal direction. Read at most limit elements; stale iterators emit no items and preserve position.

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
2	`["ok", 6, [5], 4]`	`["ok", 2, [5], 4]`	Failed

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