function createSet(values) {
    var set = new Set();
    Lazy(values || []).flatten().each(function(e) {
      set.add(e);
    });
    return set;
  }
Creates a Set containing the specified values.

@param {...Array} values One or more array(s) of values used to populate the
    set.
@returns {Set} A new set containing the values passed in.