fun KType.withNullability(nullable: Boolean): KType
Platform and version requirements: Kotlin 1.1, JVM
Returns a new type with the same classifier, arguments and annotations as the given type, and with the given nullability.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect.full/with-nullability.html