Mark Dickinson added the comment:

[Steven]
> Versus the even simpler model:
> "Return whether the number x is a NAN."

But what you're proposing doesn't match that description! Under your proposal, 
`math.isnan(10**1000)` would be `False`, but `math.isnan(Fraction(10**1000))` 
would again raise an `OverflowError`, as would `math.isnan(Decimal('1e500'))`.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27975>
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