utahstreetlabs/activevalidators — pull request #10 by dlamacchia (2012-04-23 20:20:45+00:00)
Title: Account for 20-digit USPS tracking numbers that lack a 2-digit application identifier

Given a 20-digit USPS tracking number that fails validation, try to prepend a 2-digit application identifier in the 91-95 range and revalidate. Fail validation if none of these 22-digit numbers passes.

We'll still save only the 20-digit version, because this can actually be tracked on USPS's website; they must accomodate for the version without the application identifier.