FA-95724 / Shipping rate zone lookup / Member archive

Area surcharge: last ZIP of a range missed · case 04

The final ZIP in each surcharge range escapes the fee; single-ZIP ranges never match.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

zip5 is a five-digit ZIP or ZIP+4. ranges [[lo, hi, code]] are non-overlapping inclusive five-digit ranges in any order. Look up the range containing the ZIP (sorted ranges, binary search) and return [code, fee] with DAS 395, EXT 510, REMOTE 1500 cents; uncovered ZIPs -> ["NONE", 0].

Why this case matters

Delivery area surcharges are keyed by destination ZIP ranges.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
single zip range	`["NONE", 0]`	`["DAS", 395]`	Failed

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