Ah, ok, I assumed the issue was happening outside of the function. If the issue is actually those intermediaries being mutated, bummer. As for copy vs deepcopy

Ah, ok, I assumed the issue was happening outside of the function. If the issue is actually those intermediaries being mutated, bummer. As for copy vs deepcopy, like I said, I have no idea what the type is so I don't know that deepcopy is necessary or not.