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By extensional definition I mean fencing off the notion of free will with a set of reasonably sharp (close to the free will/not free will boundary) examples of not having free will.
A rock not having free will is uncontroversial, but not sharp (very far from the boundary). I am looking for a set of examples where most people would agree that
It is an example of not having free will (uncontroversial)
It is hard to move it toward the "definitely free will" case without major disagreements from others (reasonably sharp).
And how should I make sense of that? Are you assuming that not only is the boundary fuzzy, but people disagree about the direction of motion there?
A person controlled by Borg implants seems like a good example of 1, but I think you'd find widespread agreement about what changes would make that person more or less free (except among those who insist the boundary is sharp and binary).