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In tkinter, `widget['foo'] = bar` and `widget.config(foo=bar)` do the same thing, but they will now type-check differently: the `widget['foo'] = bar` syntax allows 'foo' to be any string (e.g. a variable, not necessarily a Literal) and bar to be any object, while `widget.config(foo=bar)` checks the existence of the option and the type of bar. Similarly, cget takes a Literal argument but __getitem__ takes a string.
Testing script can still be found at c42a72c53e