Revert "Force 'use' YAML value to be an array"

I really wanted #128 to be this easy but I'm running into other issues with it.
I need to revert this for now and will revisit. Thanks for the attempt,
@jasonrhodes. At the very least, you helped me track down where we can do some
of these things and helped me think through getting started. Much appreciated!

This reverts commit 56c655e1e94c40f3fc1a4052d3524d103579416c.