struct doesn't handle NaN values?

[Grant Edwards]

Perhaps I'm doing something wrong: the struct module docs say
it's IEE 754, but I can't figure out how to get it to handle
NaN values correctly (either packing or unpacking).

>>> x = float('nan')
>>> struct.pack("<f",x)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
SystemError: frexp() result out of range

>>> struct.unpack("<f",'\xff\xff\xff\xff')
(-6.8056469327705772e+38,)

I don't have my copy of 754 at hand, but I'm pretty sure that
0xffffffff is a NaN (printf on IA32 Linux agrees) and not
-6.8056469327705772e+38 as claimed by struct.unpack().

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