void push(Peg, Hole); push(new SquarePeg(), new RoundHole()); Further reading: The Kreinin Substitutability Principle - Empirical Research on Polymorphism in the Wild
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void push(Peg, Hole); push(new SquarePeg(), new RoundHole()); Further reading: The Kreinin Substitutability Principle - Empirical Research on Polymorphism in the Wild
