[issue8947] Provide as_integer_ratio() method to Decimal

[Mark Dickinson]

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

Updated patch, taking into account comments from merwok and exarkun on #python-dev:

 - remove doctests for infinity and nan, replace with a sentence
   explaining what happens for such inputs.
 - replace 'snAN' with saner spelling 'snan'.

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Added file: http://bugs.python.org/file17627/issue8947_2.patch

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