Uncaught TypeError: this.initialValues.join is not a function List.js:73:50
I've tried a few different configuration options such as using the valuesLoopup set to 'active' or a hard coded set of values. I just wanted to double check on here to see if I'm doing something wrong before I submit it as a bug.
Here's a JSFiddle of my functioning setup. If I uncomment the multiselect configuration on line 45, the error get's thrown.