Opening an SLCAN interface results in "Invalid Data Bitrate"

[dcasnowdon]

Describe the bug

data_bitrate requires a value set -- the default results in an error.

To Reproduce

Install version 4.6.0 of python-can[serial] using pip.

Then run the following code:

can_interface="/dev/ttyACM0"
bus = can.interface.Bus(interface="slcan", channel=can_interface, bitrate=500000)

where the slack device is a canable 2.0.

The result is:

error_message = None, exception_type = <class 'can.exceptions.CanInitializationError'>

    @contextmanager
    def error_check(
        error_message: Optional[str] = None,
        exception_type: type[CanError] = CanOperationError,
    ) -> Generator[None, None, None]:
        """Catches any exceptions and turns them into the new type while preserving the stack trace."""
        try:
            yield
        except Exception as error:  # pylint: disable=broad-except
            if error_message is None:
>               raise exception_type(str(error)) from error
E               can.exceptions.CanInitializationError: Invalid data bitrate, choose one of 0, 2000000, 5000000.

Expected behavior

The above should return a valid bus, since we are not using Can FD.

Additional context

OS and version: Ubuntu 22
Python version: 3.13
python-can version: 4.6.0
python-can interface/s (if applicable): slcan

Traceback and logs