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Expiring credit grants applied to invoices: future grants excluded · case 04

Credits scheduled for next month pay this month's invoice.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input {grants: [[amount, expires_day, granted_day]], day, amount}. A grant is usable when granted_day <= day < expires_day. Usable grants are consumed soonest-expiring first (ties by earlier grant day, then input order). Return [applied, remaining_due, [[left, expires] for partially used or untouched usable grants]].

Why this case matters

Promotional credits must be burned in expiry order and never after they expire.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression 0	`[10480, 0, [[465, 48], [1384, 70]]]`	`[8552, 1928, []]`	Failed

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