FA-59633 / Subscription proration billing / Member archive

Annual plan proration across leap years: range start clip · case 03

Ranges that begin before the term start are billed for days outside the term.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Input {price, start (annual term start), from, to (exclusive)}. The term is [start, same date next year); a Feb 29 start ends on Mar 1. The requested range is clipped to the term; days = max(0, clipped length). Amount = price*days/term_days half-up. Return [term_days, amount].

Why this case matters

Annual terms have 365 or 366 days depending on whether they contain Feb 29, which changes the daily rate.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 0	`[365, 4512]`	`[365, 2908]`	Failed

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