FA-95504 / Shipping rate zone lookup / Member archive

Rate card: oldest applicable card chosen · case 04

Superseded rate cards stay in use after a new card takes effect.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

cards [[card_id, effective_from, expires or None, version]] with dates "Y-M-D" that may lack zero padding. A card applies when effective_from <= ship date < expires. Choose the latest effective_from, then highest version, then smallest card_id. None -> "NO_CARD".

Why this case matters

Carriers publish dated rate cards; each shipment must use the card in force on its ship date.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
generated mix 61	`"R2"`	`"R0"`	Failed

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