They do. I just move these functions from StackUtils and rename it. And I also realize that its implementation has some problems -- the implementation is not fully align with type coercion rules in DesignScript. I've added this issue to a document so that we could keep track of them, please check: https://docs.google.com/a/adsk-oss.com/document/d/14mUK0AysM8N4ZZBs2Ct3auFeRBNpPJtQ4kzyoz1Xnl0/edit?usp=sharing