PO box without a street address

[turbobuilt]

Hello,

The following address fails to parse properly:

PO Box 1400 Columbus, GA 33902-1200

It returns only:
sec_unit_num: "1200"
sec_unit_type: "PO Box"
street: "Columbus"

According to the USPS, it is valid to have only the PO box. Perhaps PO box should have a special case?

http://pe.usps.gov/text/pub28/28c2_005.htm

[alechirsch]

+1, any chance this could make it in?