Possible bug with Number validator

I generally expect the Number validator to either return a number
(float or int) or raise an Invalid exception. However, if I do the
following:

from formencode.validators import Number
Number.to_python('inf')

I get an OverflowError related to 'inf' being interpreted as the float
infinity. The same thing happens with 'infinity' as the input string.

Is this a for reals bug with FormEncode, or just a corner case
exception I should be aware of and catch?

Thanks,
   - Aston

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