font.IsFixedWidth failure?

This code, on my Windows XP system, with wxPython 2.8.4.0, fails to
identify fixed-width fonts:

import wx

app = wx.PySimpleApp()

face_names = wx.FontEnumerator_GetFacenames()

for face_name in face_names:
font = wx.Font(10, wx.MDERN, wx.NRMAL, wx.BLD,
underline=False, face=face_name)
print face_name.ljust(32), font.IsFixedWidth()

I.e., font.IsFixedWidth() always returns False. But faces such as
'r_ansi' are indeed fixed-width.

Is this a wxPython bug, or am I missing something basic here?


Bob