FA-46235 / Bounded deques / Member archive

Undo fails to save the current deque for redo · case 05

Undo fails to save the current deque for redo.

Member previewVariant 5 · 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
undo latest	`[[6], [[5]], []]`	`[[6], [[5]], [[7]]]`	Failed

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

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