FA-66742 / Airline fare rule evaluation / Member archive

Prorated coupon values do not add up to the fare · case 02

Interline settlement is short by a few cents on most tickets.

Member previewVariant 2 · 3 implementations · 9 checks per implementation

Case contract

Input {'fare','tpm':[miles per coupon, 0 for surface]}. Work in integer cents: each coupon gets floor(cents*tpm/total); the rounding remainder goes to the last coupon with nonzero miles; surface coupons get 0. No miles -> 'ERR_NO_MILES'. Return coupon values in currency units.

Why this case matters

Prorating a through fare across coupons by mileage must conserve the fare to the cent and keep value off surface sectors.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
three coupons uneven	`[270.2, 78.8, 652.98]`	`[270.2, 78.8, 653.0]`	Failed

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