Hi Martin.
I do not know the answer offhand.

You can copy the two loft.js and loft.htm files from the Moi command folder, (to a practice directory,) and examine them with
Notepad++. I do this quite a lot with other commands, to see how Michael does this magic programming.

(I recall one of the arc commands could not be scripted, due to the selection mechanism not being scriptable, yet.)