Designscript codeblock for Surface.Thicken node including option to extend on on one side

I`m trying to find the designscript code text for the Surface.Thicken node including the option to extend on both sides or on one side. Is there a dictionary available where I could find this?

Node to Code via right-click?


Strangely, if I create a volume in designscript and I use the same code to make the same volume in Python, it returns in a different position. Do you have an idea why?

I cannot replicate the error when re-typing your code.
Can you upload a test .dyn?