FA-8855 / Selection controls / Member archive

Radio group selection ownership: Activating a different radio fails to change selection · case 05

Activating a different radio fails to change selection.

Member previewVariant 5 · 3 implementations · 14 checks per implementation

Case contract

Radio activation replaces selection with an existing enabled option and never toggles it off; required groups cannot clear; selected removal uses first remaining option only when required.

Why this case matters

A deterministic model of radio group selection 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
activate	`[["a", "b"], "a"]`	`[["a", "b"], "b"]`	Failed

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

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