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Null labels are selected by semantic kind rather than falsy captions · case 05

Null labels are selected by semantic kind rather than falsy captions is violated by the widget projection.

Member previewVariant 5 · 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: Null labels are selected by semantic kind rather than falsy captions.

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

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