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Next part of Kotlin Programmer Dictionary explains event listener and event handler. Enjoy :slightly_smiling_face: 
<https://blog.kotlin-academy.com/programmer-dictionary-event-listener-vs-event-handler-305c667d0e3c>

is that what they use in the libcurl example?  <https://github.com/JetBrains/kotlin-native/blob/master/samples/libcurl/src/main/kotlin/org/konan/libcurl/Event.kt>

<https://medium.com/@elizarov/when-you-write-your-own-kotlin-dsl-id-recommend-to-reconsider-your-javisms-and-stick-with-simpler-4474905c17e>

I don't think `on` and `listener` are needed in method. Especially `listener` suffix is useless in Kotlin. Maybe I should add some clarification :thinking_face: