GetGeomType returns incorrect code for 3D Polygon

[dr]

When I try to get geometry type from Python:

>>> from osgeo import ogr
>>> driver = ogr.GetDriverByName('ESRI Shapefile')
>>> path = '3dpoly.shp'
>>> dataSource = driver.Open(path, 0)
>>> layer = dataSource.GetLayer()
>>> layer.GetGeomType()
-2147483645

But ogrinfo returns correct information:

INFO: Open of `3dpoly.shp'
      using driver `ESRI Shapefile' successful.
1: 3dpoly (3D Polygon)

[Even Rouault]

Not a but:

>>> from osgeo import ogr
>>> ogr.wkbPolygon25D
-2147483645