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Cancellation refund for unused days: refund rounding direction · case 05

Refunds sometimes exceed the exact unused value by a cent.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Input {price, setup, period_days, used_days, min_days, mode immediate|period_end}. Unused = max(0, period_days - used_days). period_end: no refund, access continues for the unused days. immediate: charged days = max(used_days, min_days); refund = price*max(0, period_days - charged)/period_days floored (never over-refund); the setup fee is never refunded; access ends. Return [refund, access_days].

Why this case matters

Refund math must respect minimum-charge terms and exclude non-refundable fees.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 0	`[3853, 0]`	`[3852, 0]`	Failed

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