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Displayed date span includes both endpoint days without masking reversal · case 02

Displayed date span includes both endpoint days without masking reversal is violated by the widget projection.

Member previewVariant 2 · 3 implementations · 10 checks per implementation

Case contract

A stipulated day-index filter uses inclusive display dates and an exclusive serialized end, with rolling presets bound either to live now or a frozen snapshot. This example checks: Displayed date span includes both endpoint days without masking reversal.

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	`{"custom-reset": null, "display-span": 0, "exclusive-end": 1, "future-warning": false, "rolling-end": 9, "rolling-start": 8}`	`{"custom-reset": null, "display-span": 1, "exclusive-end": 1, "future-warning": false, "rolling-end": 9, "rolling-start": 8}`	Failed

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