If you give a closer look to my example, you will notice a difference:
> $map[$setA] and $map[$setB] point to the same storage which I think is not
> possible with SPLObjectStorage.

Well, how could you do that? Without implementing object comparison methods
at least (which is outside the scope of this discussion)? I could see a
type-specific map which knows how to compare the classes, but in general
you'd need to defer comparison to the objects themselves (so $obj1 == $obj2
would fire $obj1->compareTo($obj2) === 0)...

Unless I've got something confused...

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