FA-96085 / Postal address normalization / Member archive

Post office box canonicalizer: the spelled-out prefix is missing · case 05

"post office box 101" is a street line.

Member previewVariant 5 · 3 implementations · 11 checks per implementation

Case contract

Uppercase, turn periods into spaces and collapse whitespace. If the tokens start with one of the prefixes POST OFFICE BOX, P O BOX, PO BOX, POB, BOX (whole tokens) the line is a box line: exactly one alphanumeric identifier must follow, giving {"kind": "pobox", "line": "PO BOX ID"}, otherwise {"kind": "invalid", "line": cleaned}. Other lines return {"kind": "street", "line": cleaned}.

Why this case matters

Box addresses need different delivery handling from street addresses; misclassifying either breaks carrier selection and deduplication.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
spelled-out prefix	`{"kind": "street", "line": "POST OFFICE BOX 105"}`	`{"kind": "pobox", "line": "PO BOX 105"}`	Failed

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