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Empty collection facet evidence requires a present array rather than null or missing data · case 05

Empty collection facet evidence requires a present array rather than null or missing data is violated by the widget projection.

Member previewVariant 5 · 3 implementations · 10 checks per implementation

Case contract

Collection-valued fields expose any/all/none element match modes distinct from empty-collection and missing-field predicates; switching to unary collection modes removes element operands. This example checks: Empty collection facet evidence requires a present array rather than null or missing data.

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	`{"all-empty-warning": false, "element-editor": true, "empty-collection-evidence": true, "operator-key": "collection.any", "quantifier-caption": "at least one", "unary-collection-value": ["x"]}`	`{"all-empty-warning": false, "element-editor": true, "empty-collection-evidence": false, "operator-key": "collection.any", "quantifier-caption": "at least one", "unary-collection-value": ["x"]}`	Failed

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