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@@ -13,6 +13,11 @@ What's New in Python 3.0 release candiate 3?
Core and Builtins
-----------------
+- Issue #1721812: Binary set operations and copy() returned the input type
+ instead of the appropriate base type. This was incorrect because set
+ subclasses would be created without their __init__() method being called.
+ The corrected behavior brings sets into line with lists and dicts.
+
- Issue #4296: Fix PyObject_RichCompareBool so that "x in [x]" evaluates to
True, even when x doesn't compare equal to itself. This was a regression
from 2.6.