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Make equals work when comparing a cartesianProduct against another Set. #6789

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Make equals work when comparing a cartesianProduct against another Set.

In 2012 the parent type of CartesianSet was changed from AbstractSet to ForwardingCollection, with the inadvertent effect that a CartesianSet can never compare equal to another Set unless that is also a CartesianSet.

Fixes #6780.

RELNOTES=n/a

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CartesianSet.equals always returns false for other Set types
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