Invalid prop className of type array supplied to Col, expected string

[Gsiete]

What is happening?

Since I realized that Reactstrap is already using classnames to handle className I started passing arrays directly the console.error below (hopefully soon it'll be a console.warn: facebook/prop-types#245)
I could of course call classnames my self, but it feels like it's not the best thing to do performance-wise (even though it's probably exactly what classnames will do with my array).
Of course, I understand that this would kind of bind the library to accepting class arrays, or at least bind it more...
Well, my point is, does anyone else think it'd be a good idea to allow also arrays and objects in the propTypes?

Error message in console

Failed prop type: Invalid prop `className` of type `array` supplied to `Col`, expected `string`