FA-95644 / Shipping rate zone lookup / Member archive

Flat vs weight: fractional pound uses lower rate · case 04

A 3.2 lb parcel is priced at the 3 lb rate; sub-pound parcels wrap to the heaviest rate.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

boxes [[name, L, W, H, price]] inner dims; an item fits a flat box in any orientation and flat boxes accept up to 70 lb. Weight price = weight_rates[lb-1] with lb = ceil(weight) (min 1) when lb is within the table. Choose the cheapest option; on equal price prefer flat boxes, then name. Return [option, price] or ["NONE", 0].

Why this case matters

Shippers compare flat-rate packaging with zone weight pricing.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
generated mix 58	`["WEIGHT", 1350]`	`["WEIGHT", 1600]`	Failed

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