PawelDecowski/jQuery-CreditCardValidator — pull request #18 by chrishiestand (2012-09-18 08:33:18+00:00)
Title: Additional Diner's Club Prefix

Several resources list "38520000023237" as a valid Diner's Club test number.
So the plugin should support it, unless the prefix is defunct and is still
being listed.

See e.g. https://www.paypalobjects.com/en_US/vhelp/paypalmanager_help/credit_card_numbers.htm