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Argument Clinic no longer works single optional argument. For example see _tkinter.tkapp.wantobjects in the patch in issue20168.
/*[clinic input]
_tkinter.tkapp.wantobjects
 [
 value: int
 ]
 /
[clinic start generated code]*/
It is converted to the methoddef of type METH_O.
#define _TKINTER_TKAPP_WANTOBJECTS_METHODDEF \
 {"wantobjects", (PyCFunction)_tkinter_tkapp_wantobjects, METH_O, _tkinter_tkapp_wantobjects__doc__},
static PyObject *
_tkinter_tkapp_wantobjects(PyObject *self, PyObject *arg)
{
 PyObject *return_value = NULL;
 int group_right_1 = 0;
 int value = 0;
 if (!PyArg_Parse(arg, "i:wantobjects", &value))
 goto exit;
 return_value = _tkinter_tkapp_wantobjects_impl(self, group_right_1, value);
exit:
 return return_value;
}
As result wantobjects() can't be called without an argument.