$ cat pyi061.py
from typing import Literal
x: Literal[None] | None

$ ruff check --isolated --preview --select PYI061 pyi061.py --fix
Found 1 error (1 fixed, 0 remaining).

$ cat pyi061.py
from typing import Literal
x: None | None

$ python pyi061.py 
Traceback (most recent call last):
  File "pyi061.py", line 2, in <module>
    x: None | None
       ~~~~~^~~~~~
TypeError: unsupported operand type(s) for |: 'NoneType' and 'NoneType'

$ cat ruf020.py
from typing import Never
x: None | Never | None

$ ruff check --isolated --select RUF020 ruf020.py --fix
Found 1 error (1 fixed, 0 remaining).

$ cat ruf020.py
from typing import Never
x: None | None

$ python ruf020.py
Traceback (most recent call last):
  File "ruf020.py", line 2, in <module>
    x: None | None
       ~~~~~^~~~~~
TypeError: unsupported operand type(s) for |: 'NoneType' and 'NoneType'