recurly/recurly-client-ruby — pull request #41 by kreynolds (2011-11-05 13:00:15+00:00)
Title: Handle number obfuscation when the number parameter is shorter than 4 characters

I don't know if this is exactly how you want to handle numbers sent in that are shorter than 4 characters, but it was raising uncaught exceptions during testing so I took a guess at how you might want to handle it.