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Comment:

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Deletions are marked like this.  Additions are marked like this. 
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}}} {{{ sage: sage: S = Set(QQ) sage: sage: T = Set(ZZ['x']) sage: sage: X = S.intersection(T) sage: a = X._X(4); a 4 sage: b = X._Y(4); b 4 sage: a == b False sage: QQ(4) == ZZ['x'](4) True 
Segfaults
Errors
TypeError: sage.structure.parent.Set_generic.__new__(Set_object_enumerated) is not safe, use sage.structure.wrapper_parent.WrapperParent_model1.__new__()
sage: sage: S = Set(QQ) sage: sage: T = Set(ZZ['x']) sage: sage: X = S.intersection(T) sage: a = X._X(4); a 4 sage: b = X._Y(4); b 4 sage: a == b False sage: QQ(4) == ZZ['x'](4) True
sage: pi in QQ  <type 'exceptions.AttributeError'> Traceback (most recent call last) /opt/sage2.10.1/devel/sagemain/sage/sets/<ipython console> in <module>() /opt/sage2.10.1/devel/sagemain/sage/sets/parent.pyx in sage.structure.parent.Parent.__contains__ (sage/structure/parent.c:2221)() /opt/sage2.10.1/devel/sagemain/sage/sets/parent.pyx in sage.structure.parent.Parent.__call__ (sage/structure/parent.c:1993)() /opt/sage2.10.1/devel/sagemain/sage/sets/morphism.pyx in sage.categories.morphism.Morphism.__call__ (sage/categories/morphism.c:2677)() /opt/sage2.10.1/devel/sagemain/sage/sets/coerce_maps.pyx in sage.structure.coerce_maps.NamedConvertMorphism._call_ (sage/structure/coerce_maps.c:3414)() <type 'exceptions.AttributeError'>: 'Pi' object has no attribute '_rational_'