code: function(set1, set2) {
      return this.jointSetWithCallback(set1, set2, function(a,b) { return this.eq(a,b); });
    }
docs: SpahQL.DataHelper.jointSet(set1, set2) -> Boolean result
  - set1 (Array): The value at the left-hand side of the comparator
  - set2 (Array): The value at the right-hand side of the comparator
  
  Compares two sets and returns a result of true if any value in the left-hand
  set is strictly equal to any value from the right-hand set.