> Your code doesn't account for the possibility that the order of
> comparison might happen in the other order (i.e. [@"123" isEqual:
> object]). I wouldn't be surprised if NSSet is assuming that equality
> is transitive (i.e. [a isEqual: b] == [b isEqual: a]).

For reference, this property is not transitivity, the transitivity relation is:

a -> b ^ b -> c => a -> c (for some relation ->)

The one you're looking for is commutativity.

Bob_______________________________________________

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