[issue8188] Unified hash for numeric types.

[Mark Dickinson]

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

Here's a version of the patch that adds exact comparisons between the various numeric types.  The only slightly tricky comparison is the Fraction <-> Decimal one:  an obvious strategy is to convert the Decimal exactly to a Fraction and then use the fraction comparison, but this is inefficient for Decimal instances with large exponent.  So instead, we compare a Decimal `x` with a Fraction `n/d` by comparing `x*d` with `n` in the Decimal domain.

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Added file: http://bugs.python.org/file16675/numeric_hash5.patch

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<http://bugs.python.org/issue8188>
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