Is there a way to set kerning value for all masters at once via GUI?

Oh nice! Is there any logic or a way to know what is deep-copyable and what is not? Sometimes I stay away from those methods even if dir shows them because not sure how reliable it is, how deep it goes and so on.

All the GS objects are deep copied even when you just copy them.

Other than that you need to try. You can try to print the repr() of the original and the copy to see if all elements are different.

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