FA-25493 / Filter interfaces / Member archive

Facet identities preserve both semantic kind and empty-string payload · case 03

Facet identities preserve both semantic kind and empty-string payload is violated by the widget projection.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

The null facet uses a reserved sentinel separate from empty string, missing field and literal null text; its label and serialization retain that distinction. This example checks: Facet identities preserve both semantic kind and empty-string payload.

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	`{"count-key": "@null", "empty-caption": "x", "identity-tag": "x", "missing-distinction": false, "null-label": "(no value)", "null-operand": {"is_null": true}}`	`{"count-key": "@null", "empty-caption": "x", "identity-tag": ["null", "x"], "missing-distinction": false, "null-label": "(no value)", "null-operand": {"is_null": true}}`	Failed

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