mdedetrich commented on issue #2178:
URL: https://github.com/apache/pekko/issues/2178#issuecomment-3266796907
> holder.elem match {
> case Success(elem) =>
> if (elem != null) {
> push(out, elem)
> pullIfNeeded()
> } else {
> // elem is null
> pullIfNeeded()
> pushNextIfPossible()
> }
> You can see, in mapAsync , when the result value is `null`, it just drop
it and `pull` upstream again, does that wrong? here is the same, but more
explicitly with `mapNotNull/collectNotNull`
If it does that, its either illegal (see
https://github.com/reactive-streams/reactive-streams-jvm#2.13 and hence not
following the reactive/java streams specification) or its an internal
optimization detail thats not publicly visible to users.
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