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Deque savepoint insertion overwrites outer checkpoints · case 03

Deque savepoint insertion overwrites outer checkpoints.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case contract

Deque savepoints capture ordered snapshots by unique tag. Rolling back restores a named snapshot and discards it plus nested checkpoints. Release discards the same checkpoint suffix without restoring data. Unknown tags preserve state.

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
4	`[[3], [[4, [3]]], 4, true]`	`[[3], [[1, [2]], [4, [3]]], 4, true]`	Failed

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