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Controlled and uncontrolled input ownership: Change events report the old controlled value · case 02

Change events report the old controlled value.

Member previewVariant 2 · 3 implementations · 10 checks per implementation

Case contract

None alone signals uncontrolled; defaults initialize only on mount/reset; controlled values stay prop-owned while proposed changes are emitted; uncontrolled changes update local state.

Why this case matters

A deterministic model of controlled and uncontrolled input ownership; this isolates one interface invariant without requiring a browser.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
controlled event	`["old", "local", "old"]`	`["old", "local", "new"]`	Failed

MEMBER ARCHIVE

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

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