FA-46709 / Bounded deques / Member archive

Failed deque iterator split resets the retained start position · case 04

Failed deque iterator split resets the retained start position.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Split an iterator range into disjoint prefix and suffix if its length meets a positive minimum. Both halves retain the same captured deque epoch and cover every original element exactly once.

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
short shifted remainder	`[null, [0, 3, 6], [6]]`	`[null, [2, 3, 6], [6]]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.