FA-95352 / Shipping rate zone lookup / Member archive

Zone chart: last ZIP3 of a range unmatched · case 02

Destinations on the last ZIP3 of a chart row fall to a wider row or NO_ZONE.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

dest is a ZIP string with optional surrounding whitespace, optionally ZIP+4 ("12345-6789"), or a 4-digit ZIP whose leading zero was lost (left-pad one zero). chart [[lo3, hi3, zone]] inclusive ZIP3 ranges; the narrowest matching range wins, earliest listed on equal width. Malformed -> "INVALID"; no match -> "NO_ZONE".

Why this case matters

Carrier zone charts map origin to destination ZIP3 ranges, the first step of rating.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
generated mix 28	`"NO_ZONE"`	`8`	Failed

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