SteveSanderson/knockout — pull request #930 by lelandrichardson (2013-04-24 05:23:29+00:00)
Title: Adding ko.bindingHandlers.css support for Array<string> values

added a simple check for value being an array, and converted to a
space-separated string if true.

I believe this to be the expected behavior - since currently it ends up
serializing the array indices to a string which doesn't even result in
valid CSS classes.