It looks to me like ClonableArray stores its object as a list
(I looked at ClonableArray.__init__)
while CombinatorialClass can keep the object as a Set,
but I didn't trace down the code very far.
If you convert a SetPartition to a list first then you
can map to sage Set.
sage: A = SetPartition([[1,2],[3,4]])
sage: B = SetPartition([[1],[2],[3,4]])
sage: Set(list(A)).intersection(Set(list(B)))
{{3, 4}}
sage: set(A).intersection(set(B))
set([{3, 4}])
-Mike
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