Different way of solving multiple input problem

I saw your PR at https://github.com/jessepollak/card/pull/64; this is how I had solved it on my local copy.
All you have to do is this:
nameInput: "#billing_first_name,#billing_last_name"
It negates having to add additional input variables, and only requires that the inputs be put in the desired order, as the loop just concatenates the values in order.
Again, I'm not a javascript wizard - this is just how I solved it when I was working with forms that required multiple inputs.