mdedetrich commented on code in PR #1819:
URL: https://github.com/apache/pekko/pull/1819#discussion_r2052649781


##########
stream/src/main/scala/org/apache/pekko/stream/stage/GraphStage.scala:
##########
@@ -1643,7 +1644,10 @@ abstract class GraphStageLogic private[stream] (val 
inCount: Int, val outCount:
  *
  * Typical use cases are exchanging messages between stream and substreams or 
invoking from external world sending
  * event to a stream
+ *
+ * Not for user extension
  */
+@DoNotInherit

Review Comment:
   Not sure if applicable but `@DoNotInherit` doesn't indicate that it can 
never be inherit, just that it shouldn't be inherited by users of Pekko. The 
Pekko library itself can inherit it as much as it wants.
   
   The reason this annotation exists is because of limitations in Java, i.e. 
Java has no concept of sealed like Scala/Kotlin has



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