FA-95744 / Shipping rate zone lookup / Member archive

Region matrix: same ZIP3 not local · case 04

Deliveries within the same ZIP3 are rated as regional zone 2.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

origin and dest are five-digit ZIP strings. Same ZIP3 -> zone 1. regions [[lo3, hi3, region]] inclusive. Unknown region -> "NO_ZONE". Same region -> zone 2. Otherwise the matrix [[region_a, region_b, zone]] lists each pair once and applies in both directions; unlisted pair -> "NO_ZONE".

Why this case matters

Regional carriers rate by origin and destination region matrices.

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	`2`	`1`	Failed

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