FA-25208 / Filter interfaces / Member archive

Strict ancestor markers exclude self and partial segment prefixes · case 03

Strict ancestor markers exclude self and partial segment prefixes is violated by the widget projection.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Hierarchical facet identities are path tuples. Breadcrumb display, sibling scoping and subtree indicators operate on path segments rather than string prefixes. This example checks: Strict ancestor markers exclude self and partial segment prefixes.

Why this case matters

Filter-widget state and serialization must preserve user constraints while the view changes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
contract fixture 0	`{"ancestor": true, "breadcrumb": "a / b", "leaf-label": "b", "same-leaf": true, "sibling": false, "up-navigation": ["a"]}`	`{"ancestor": false, "breadcrumb": "a / b", "leaf-label": "b", "same-leaf": true, "sibling": false, "up-navigation": ["a"]}`	Failed

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