A game semantic approach to interpreting call-by-value polymorphism is described, based on extending Hyland-Ong games (which have already proved a rich source of models for higher-order programming languages with computational effects) with explicit "copycat links". This captures universal quantification in a simple and concrete way; it is effectively presentable, and opens the possibility of extending existing model checking techniques to polymorphic types. In particular, we present a fully abstract semantics for a call-by-value language with general references and full higher-rank polymorphism, within which polymorphic objects, for example, may be represented. We prove full abstraction by showing that every universally quantified type is a definable retract of its instantiation with the type of natural numbers.
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