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Keyed component instance reconciliation: Cleanup before replacement mount · case 04

Cleanup before replacement mount.

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Case contract

A component instance is identified by sibling key plus component type. Reordering preserves its state, changing type remounts, removed keys lose state, and replacement cleanup happens before mount. Operation cleanup-before-replacement-mount has the six explicit input/output oracles below.

Why this case matters

An offline client lifecycle model that isolates a state-management defect without DOM rendering or network services.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
cleanup-before-replacement-mount scenario 3	`[["a", "mount"]]`	`[["a", "cleanup"], ["a", "mount"]]`	Failed

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