[IronPython] Differences between Ironpython and CPython 2.4

[walgri]

Hello,

I have been trying IronPython with the Unum module
(http://home.tiscali.be/be052320/Unum.html) which, in about 400 locs,
adds a complete and seamless measure units support to Python.

In Cpython2.4 I can write code like this:

Python 2.4.2 (#67, Sep 28 2005, 12:41:11) [MSC v.1310 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from unum.units.si import *
>>> 1*M
1.000 [m]
>>> 1*N/(2*M**2)
0.500 [N/m2]
>>>

Whereas in Ironpython (both official and community edition) I get the
following error:

IronPython 1.0.2463 on .NET 2.0.50727.42
Copyright (c) Microsoft Corporation. All rights reserved.
>>> from unum.units.si import *
>>> 1*M
1.000 [m]
>>> 1*N/(2*M**2)
Traceback (most recent call last):
  File , line 0, in <stdin>##142
  File C:\tempor\IPCE-1.0r2\IPCE-1.0r2\Lib\unum\__init__.py, line
566,in __repr__
  File C:\tempor\IPCE-1.0r2\IPCE-1.0r2\Lib\unum\__init__.py, line 558,in __str__
  File C:\tempor\IPCE-1.0r2\IPCE-1.0r2\Lib\unum\__init__.py, line
253,in normalize
  File C:\tempor\IPCE-1.0r2\IPCE-1.0r2\Lib\unum\__init__.py, line
213,in replaced
  File C:\tempor\IPCE-1.0r2\IPCE-1.0r2\Lib\unum\__init__.py, line 389,in __pow__
ZeroDivisionError: 0.0 cannot be raised to a negative power
>>>

I can investigate further but need some directions.
I understand that this can be a very specific issue, but any help
would be really appreciated.

Best regards,
Walgri