We all know that [42 is the answer to everything](http://entertainment.howstuffworks.com/hitchhikers-history.htm), but it's news to me that it is a valid credit card number.

Try entering '42' or '42176' into this [jQuery Validation testing page](http://docs.jquery.com/Plugins/Validation/Methods/creditcard) and click OK.

What's going on? I thought this was supposed to be the de-facto validation library. Even Microsoft is using it now, but it thinks '42' and '42176' are valid credit card numbers?! It's not even doing a length check. Surely I'm not responsible for adding a length check too? It's called 'creditcard' validator and not 'luhn' validator.

**Edit**: hitchhiker humor aside - how would I go about patching the validation plugin to check length. is that easy?