FA-46293 / Bounded deques / Member archive

Range reverse drops the first element after the range · case 03

Range reverse drops the first element after the range.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Reverse a valid half-open range in a bounded deque and return an old-index to new-index mapping for stable bookmarks. Empty ranges leave all positions unchanged.

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
0	`[[3, 6, 5, 4], [0, 3, 2, 1, 4]]`	`[[3, 6, 5, 4, 7], [0, 3, 2, 1, 4]]`	Failed

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