Amaury Forgeot d'Arc added the comment:
"Py_INCREF(v); return v;" should be used only for immutable types, not for
subclasses. in 3.2, the code below prints "3, None":
import decimal
class MyDecimal(decimal.Decimal):
x = None
def __new__(cls, value):
return super().__new__(cls, value)
return obj
a = MyDecimal("1.1")
a.x = 3
b = MyDecimal(a)
print(a.x, b.x)
----------
nosy: +amaury.forgeotdarc
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<http://bugs.python.org/issue16431>
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