[issue10356] decimal.py: hash of -1
Mark Dickinson
report at bugs.python.org
Fri Nov 19 12:12:19 CET 2010
Mark Dickinson <dickinsm at gmail.com> added the comment:
[Stefan]
> ... a direct request to raise an exception...
Understood; the issue is that this conflicts with the general expectation that equality (and inequality) comparisons always work (at least, for objects that are perceived as immutable). I think there needs to be a very good reason to have an equality comparison raise an exception, and I don't find this particular reason good enough. The expected IEEE 754 semantics are still available through the published API: e.g., using Decimal.compare instead of '=='.
So I'd lean towards having '==' follow Python rules rather than IEEE 754 rules in this case, with Decimal.compare available for the times when the IEEE 754 rules are important.
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