underscore.js - Is there a function that produces an array thats the difference of two arrays?

Looking for a function in underscore.js that will take 2 arrays and return a new array of unique values? Something like _without

_.without([0, 1, 3, 9], [1, 3]);

I would like => [0,9] returned

It appears _without's 2nd arg is a list of values, not an array. Anyone out there know if underscore has the specific function I'm looking for? Or can I take an exisitng array and covert it to values the function expects.

Thanks,
~ck in San Diego