The single inheritance hierarchy is a Tree... I don't see any interest in answering a Set. Some tools might expect a Set... If so, they just have to use withAllSubclasses asSet. If my own tool expect a LinkedList, I ain't gonna change the Kernel library for my conveniency, or am I ? Nicolas 2010/2/23 Stéphane Ducasse <stephane.ducasse@inria.fr>:
Nicolas I remember that we discussed this point or a related one a while ago
Squeak
    Point withAllSubclasses         an OrderedCollection(Point)
Pharo
    Point withAllSubclasses         a Set(Point)
Do you remember? I forgot?
Stef
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