[issue5186] Reduce hash collisions for objects with no __hash__ method

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Here is an updated benchmark script, for both object() and an
user-defined class, and adding dict lookup, set lookup and set difference.
Set difference is massively faster: up to 60% faster.

Added file: http://bugs.python.org/file13039/time_object_hash.py

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<http://bugs.python.org/issue5186>
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