[pypy-issue] Issue #2587: decimal.py: compare_total(): unexpected result with NaN operand (pypy/pypy)

[Stefan Krah]

New issue 2587: decimal.py: compare_total(): unexpected result with NaN operand
https://bitbucket.org/pypy/pypy/issues/2587/decimalpy-compare_total-unexpected-result

Stefan Krah:

NaN operands are handled differently from _pydecimal:

Expected:

```
>>> Decimal('4367').compare_total(Decimal('NaN'))
Decimal('-1')
```

Got:

```
>>>> Decimal('4367').compare_total(Decimal('NaN'))
Decimal('NaN')
```