FA-95599 / Shipping rate zone lookup / Member archive

Injection zone: equal hubs resolved by list order · case 04

Two hubs with the same zone and linehaul are chosen by input order.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

dest [x, y] and points [[name, x, y, linehaul_cents]] on a mile grid. Distance = straight line rounded up to a whole mile. Zone bands (miles, inclusive upper): 50, 150, 300, 600, 1000, 1400, 1800 -> zones 1-7, beyond -> 8. Choose the point with the lowest zone, then linehaul, then name. Return [name, zone, miles] or None.

Why this case matters

Zone skipping injects parcels at the hub that minimizes delivery zone and linehaul.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
name tiebreak	`["Z", 1, 10]`	`["M", 1, 10]`	Failed

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