FA-95717 / Shipping rate zone lookup / Member archive

Area surcharge: first ZIP of a range missed · case 02

The first ZIP of each surcharge range is not surcharged.

Member previewVariant 2 · 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
generated mix 18	`["NONE", 0]`	`["EXT", 510]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.