(fox, fox) should yield False

The task demands to

determine whether you can swap two letters in the first string to get the second string

One of the tests reads `assert switch_strings('fox', 'fox') == True`.
Could someone please explain, which two letters I can switch in fox so I get fox in return?
In my opinion, this input should result in `False`.

In contrast, I agree with `assert switch_strings('boss', 'boss') == True`.
Here you can switch third (s) and fourth (s), and we still have `boss`.