FA-96283 / Postal address normalization / Member archive

Address display casing: unit letters are lowercased with ordinals · case 03

"APT 1B" prints as "Apt 1b".

Member previewVariant 3 · 3 implementations · 7 checks per implementation

Case contract

Input a normalized uppercase line. Tokens in the keep set (PO, NE, NW, SE, SW, N, S, E, W, RR, HC) stay uppercase. Tokens starting with a digit keep the digits; an ordinal tail ST/ND/RD/TH is lowercased, any other tail (a unit letter) is kept. Other tokens are capitalized per hyphen part and per apostrophe part, and a part starting with MC is written Mc plus a capital.

Why this case matters

Normalized addresses are stored uppercase but printed on customer-facing documents; wrong casing of ordinals, directionals and unit letters looks like a different address.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
unit identifier keeps its letter	`"Apt 3b"`	`"Apt 3B"`	Failed

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