Issue #2534: speed up isinstance() and issubclass() by 50-70%, so as to
match Python 2.5 speed despite the __instancecheck__ / __subclasscheck__
mechanism. In the process, fix a bug where isinstance() and issubclass(),
when given a tuple of classes as second argument, were looking up
__instancecheck__ / __subclasscheck__ on the tuple rather than on each
type object.
Reviewed by Benjamin Peterson and Raymond Hettinger.
diff --git a/Misc/NEWS b/Misc/NEWS
index 2d91cb1..e001936 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,13 @@
Core and Builtins
-----------------
+- Issue #2534: speed up isinstance() and issubclass() by 50-70%, so as to
+ match Python 2.5 speed despite the __instancecheck__ / __subclasscheck__
+ mechanism. In the process, fix a bug where isinstance() and issubclass(),
+ when given a tuple of classes as second argument, were looking up
+ __instancecheck__ / __subclasscheck__ on the tuple rather than on each
+ type object.
+
- Issue #3663: Py_None was decref'd when printing SyntaxErrors.
- Issue #3657: Fix uninitialized memory read when pickling longs.