Stefan Krah added the comment:
Infinities do not have payloads. It's a bug in decimal.py that it
accepts non-empty coefficients when constructing infinities.
Since there was a corresponding unit test for as_tuple(), I've
kept the wrong representation for _decimal:
# XXX non-compliant infinity payload.
d = Decimal("Infinity")
self.assertEqual(d.as_tuple(), (0, (0,), 'F') )
But this unit test is only executed for the Python version:
# XXX coefficient in infinity should raise an error
if self.decimal == P:
d = Decimal( (0, (4, 5, 3, 4), 'F') )
self.assertEqual(d.as_tuple(), (0, (0,), 'F'))
d = Decimal( (1, (0, 2, 7, 1), 'F') )
self.assertEqual(d.as_tuple(), (1, (0,), 'F'))
My suggestion is to disallow non-empty tuples for decimal.py
and change the infinity tuple to (0, (), 'F').
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nosy: +mark.dickinson
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<http://bugs.python.org/issue15882>
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