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covariant

fun covariant(type: KType): KTypeProjection

Creates a covariant projection of a given type, denoted by the out modifier applied to a type. For example, in the type Array<out Number>, out Number is a covariant projection of the type of class Number.

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect/-k-type-projection/covariant.html