How is the datatype of type parameter decided in covariance and contravariance?

How is the datatype of type parameter decided in covariance and
contravariance?



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2.Covariance and contravariance (computer science ...

Description:Many programming language type systems support subtyping. For
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4.Subtyping - Wikipedia, the free encyclopedia

Description:In programming language theory, subtyping (also subtype
polymorphism or inclusion polymorphism) is a form of type polymorphism in
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Description:Number data types store numeric values. They are immutable
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