I pressed num 0 and my output is:
KeyRelease event, serial 33, synthetic NO, window 0x3600001,
root 0xb3, subw 0x0, time 224315, (167,-10), root:(171,12),
state 0x2010, keycode 90 (keysym 0xffb0, KP_0), same_screen YES,
XLookupString gives 1 bytes: (30) "0"
XFilterEvent returns: False
I tried binds on numpad buttons but the same problem :-/ (I hope numpad buttons are /bind 0 say hi too)
And BTW on windows normal 0 - 9 work fine...