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Just had a quick look at numbers.py. Only two comments:
1. I think there's a typo in the docstring for Inexact: one of those == should be a != 
2. Not that it really matters now, but note that at least for Decimal, x-y is not the same 
as x+(-y) (I'm looking at Complex.__sub__), and +x is not a no-op (Real.real, 
Real.conjugate). In both cases signs of zeros can be problematic:
>>> x = Decimal('-0')
>>> y = Decimal('0')
>>> x-y
Decimal("-0")
>>> x+(-y)
Decimal("0")
>>> x
Decimal("-0")
>>> +x
Decimal("0")
Of course the first point wouldn't matter anyway since Decimal already implements __sub__; 
the second means that if Decimal were to join Real, something would need to be done to 
avoid Decimal("-0").real becoming Decimal("0").