[issue2303] isinstance is 4x as slow as in 2.5 because the common case raises

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Does anyone care about this still?

I added some comments on
http://codereview.appspot.com/504

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2303>
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