Comment #6 on issue 3652 by [email protected]: Make sure classes play nice
with potential subclasses
http://code.google.com/p/sympy/issues/detail?id=3652
Another thing is that a lot of classes in numbers.py are using
@staticmethod for things like __abs__ and just returning the singelton
value of that class, rather than defining __abs__(self): return self, which
would do the right thing in a subclass.
We should also check that such classes work at all with subclasses (I'm not
sure if Singleton will do the right thing, but maybe it will).
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