I saw that too. Will investigate.
Thanks a lot. I’m afraid I really urgently need this to work, as a client project is waiting to be done. I cannot spare the time to create all subset variable font files by hand, especially after having spent a week building a script that does it all automatically 
Thanks a lot!
You can also download 3116 again to get this done:
Found the problem:
the second argument to saveToURL_type_error_ should be a number (I use constants for those and so I didn’t see it right away).
GSPackageFlatFile = 1
GSPackageBundle = 2
Font.saveToURL_type_error_(NS_url, GSPackageBundle, None)
That works!!! Thank you!!!