PO Boxes not parsed properly

[etcook]

I'm running into an issue where the gem isn't parsing PO Boxes properly

[6] pry(main)> StreetAddress::US.parse("PO Box 253, Cream Ridge NJ 08514-0253")
=> nil

[etcook]

Looks like the ruby gems version was old, so I'm using the git repo directly, however I'm running into a new issue:

[1] pry(main)> StreetAddress::US.parse("PO Box 253, Cream Ridge, NJ 08514-0253")
=> #<StreetAddress::US::Address:0x007ff2539aadb0 @redundant_street_type=false, @street="Cream", @street_type="Rdg", @Unit="253", @unit_prefix="Po Box">

If it's a PO Box, there is no street, but it's interpreting the city as the street.