FA-25213 / Filter interfaces / Member archive

Sibling scope requires equal parents and a different leaf · case 03

Sibling scope requires equal parents and a different leaf 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: Sibling scope requires equal parents and a different leaf.

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": false, "breadcrumb": "", "leaf-label": "(root)", "same-leaf": false, "sibling": true, "up-navigation": []}`	`{"ancestor": false, "breadcrumb": "", "leaf-label": "(root)", "same-leaf": false, "sibling": false, "up-navigation": []}`	Failed

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