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Thanks for your patch!  I've checked it into CVS, with two 
modifications.  First, I removed the code to handle the case 
where Python doesn't have a unicode() built-in; there's no 
expection that 
you can take the standard library for Python version N and use 
it with version N-1, so this code isn't needed.

Second, I changed string.zfill() to take the str() and not the repr()
when it gets a non-string object because that seems to make 
more sense.