Selfish is a property of objects: it means that the object has an identity (for sameness purposes) unique to the event of its creation. Selfish is the antonym of Selfless.
You can think of comparisons between Selfish objects as comparing pointers, though this is not entirely accurate in the presence of forwarding refs.
All mutable objects either are Selfish or contain Selfish components, since nothing can be Selfless and mutable. XXX Explain this further?
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