Signed integer for windows error code in function for raising WindowsError exception

Python Help
1

The bunch of functions to raise windows errors have the following signatures:

pyerrors.h:187

PyAPI_FUNC(PyObject *) PyErr_SetFromWindowsErrWithFilename(
    int ierr,
    const char *filename        /* decoded from the filesystem encoding */
    );
PyAPI_FUNC(PyObject *) PyErr_SetFromWindowsErr(int);
PyAPI_FUNC(PyObject *) PyErr_SetExcFromWindowsErrWithFilenameObject(
    PyObject *,int, PyObject *);

Note that they accept error code as signed integer. However, the GetLastError function to receive errorcode in windows returns DWORD - unsigned integer:

_Post_equals_last_error_ DWORD GetLastError();

This leads to incorrect error code handling when working with winapi,
e.g.

OSError: [WinError -536870389] Windows Error 0xe000020b

Right now it looks like a bug for me…
I tried to figure out why do these functions accept signed integer, but could not find anything. Is there a reason which I do not see?

I understand that public API signatures are probably impossible to change, but at-least could we internally cast it back to unsigned?