$ python -V
Python 3.13.4

$  mypy -V
mypy 1.16.0 (compiled: yes)

$ mypy -h
...
None and Optional handling:
  Adjust how values of type 'None' are handled. For more context on how mypy handles values of type 'None', see: https://mypy.readthedocs.io/en/stable/kinds_of_types.html#no-strict-optional
...

$ mypy -h
...
None and Optional handling:
  Adjust how values of type 'None' are handled. For more context on how mypy handles values of type 'None', see: https://mypy.readthedocs.io/en/stable/kinds_of_types.html#optional-types-and-the-none-type
...