fun contravariant(type: KType): KTypeProjection
Creates a contravariant projection of a given type, denoted by the in modifier applied to a type. For example, in the type MutableList<in Number>, in Number is a contravariant projection of the type of class Number.
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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect/-k-type-projection/contravariant.html