[pepoluan]

Slicing is totally hintable as well.

Change the declaration to:

def __getitem__(self, i: int | slice)

Though to be honest I am more concerned about that function that accepts a wild variety of objects that seem to be from different domains...

I'd guess inside the function is a HUGE ladder of 'if isinstance()' to handle the various types and special processing needed. Which is totally reeking of code smell.