FA-46218 / Bounded deques / Member archive

New deque edit retains the abandoned redo branch · case 03

New deque edit retains the abandoned redo branch.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Bounded deque edits store the complete prior logical snapshot. Undo and redo transfer current snapshots between independent history stacks. A new edit invalidates redo history.

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
edit invalidates redo	`[[3, 5], [[2], [3]], [[4]]]`	`[[3, 5], [[2], [3]], []]`	Failed

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