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Rate shopping: slower service wins price tie · case 03

Between equally priced services, the slower one is chosen.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

quotes [[carrier, service, price_cents, transit_days, max_lb]]. Eligible when weight <= max_lb, transit <= deadline and the carrier is not excluded (case-insensitive). Choose lowest price, then fewest days, then carrier, then service. Return [carrier, service, price] or None.

Why this case matters

Rate shopping chooses the cheapest eligible carrier service for a delivery promise.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
generated mix 39	`["UPX", "GROUND", 1200]`	`["USP", "PRIORITY", 1200]`	Failed

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