FA-85724 / Ride-hailing fare and surge pricing / Member archive

Cash step taken from the fare currency · case 04

A CHF fare paid in euro cash is rounded to 5 cents.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

Convert a fare to the payment currency with the directed rate fx[FROM+TO] = [num, den] (half up), then, for cash payments only, round half up to the payment currency cash step (CHF 5 centimes, SEK 100 ore, others 1). Card and wallet payments are not cash-rounded. Return the amount in minor units of the payment currency.

Why this case matters

Ride-hailing prices are computed per trip at scale; ordering, unit and boundary slips become systematic over- or under-charging.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression: cash step currency	`28698`	`28700`	Failed

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