val <T : Any> KClass<T>.memberExtensionProperties: Collection<KProperty2<T, *, *>>
Platform and version requirements: Kotlin 1.1, JVM
Returns extension properties declared in this class and all of its superclasses.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect.full/member-extension-properties.html