[issue7279] decimal.py: == and != comparisons involving NaNs

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Allowed hashing of Decimal('nan') in r79589;  Decimal('snan') continues to raise TypeError.

I've also rewritten Decimal.__hash__ a little bit, so that it won't care if float('inf') raises an exception.  This will all be much neater if the unified numeric hash is applied.

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<http://bugs.python.org/issue7279>
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