in src/main/scala/kotlin/KotlinCompile.scala [277:284]
def updateDynamic(field: String)(value: Any): Unit = {
val methodName = setterName(field)
val setterOpt = compilerArgsClass.getMethods.find(_.getName == methodName)
setterOpt match {
case Some(setter) => setter.invoke(instance, value.asInstanceOf[Object])
case None => compilerArgsClass.getField(field).set(instance, value)
}
}