in elitzur-avro/src/main/scala/com/spotify/elitzur/converters/avro/AvroConverter.scala [83:88]
override def toAvroDefault(v: Option[T], defaultGenericContainer: GenericContainer): Any = {
v match {
case None => null
case Some(t) => implicitly[AvroConverter[T]].toAvroDefault(t, defaultGenericContainer)
}
}