Function fastcall_with_keywords

pub unsafe fn fastcall_with_keywords(
    slf: *mut PyObject,
    args: *const *mut PyObject,
    nargs: Py_ssize_t,
    kwnames: *mut PyObject,
    f: for<'py> unsafe fn(_: Python<'py>, _: *mut PyObject, _: *const *mut PyObject, _: Py_ssize_t, _: *mut PyObject) -> PyResult<*mut PyObject>,
) -> *mut PyObject