FA-85784 / Ride-hailing fare and surge pricing / Member archive

Meter total truncated · case 04

The meter drops fractional cents instead of rounding.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

A single-tariff taximeter bills each segment [seconds, meters] by distance when its speed is at least v m/s (meters >= v*seconds, so a zero-duration movement bills distance) and by time otherwise, never both. Charges accumulate exactly (per_km per 1000 m, per_hour per 3600 s) and the total is rounded half up to a cent once, then the flag fall is added.

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: final rounding	`301`	`302`	Failed

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