[issue2115] __slots__ make attribute setting 10x slower

[Thomas Heller]

Thomas Heller added the comment:

PyObject_IsSubclass() has the same problem.

BTW; calling PyObject_GetAttr() with interned strings for
"__instancecheck__" and "__subclasscheck__" brings not enough speedup.

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue2115>
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