FA-95754 / Shipping rate zone lookup / Member archive

Region matrix: region end ZIP3 unassigned · case 04

ZIP3s at the upper edge of a region are treated as unknown.

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 61	`"NO_ZONE"`	`2`	Failed

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