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Hierarchical checkbox cascade: Cascaded leaves fail to merge with retained checks · case 03

Cascaded leaves fail to merge with retained checks produces the wrong hierarchical widget state in a regression fixture.

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Descendants and leaves are supplied for one branch, without cycles. Toggle writable leaves only. Preserve disabled and unrelated checks; derive parent state from writable leaves; unknown children force mixed unless no leaves are checked.

Why this case matters

Offline executable model of a hierarchical accessibility interaction; inputs are bounded and valid as stipulated. No browser, assistive technology, or normative ARIA conformance is claimed.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
partial	`[[], "false", ["c0"], true]`	`[["outside", "c0", "c1", "c2", "c3", "c4"], "true", ["c2", "c3", "c4"], true]`	Failed

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

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