ActorRefExtensions.IsNobody doc says the exact opposite what it does

[aledefault]

Which pages have you looked at?
https://github.com/akkadotnet/akka.net/blob/dev/src/core/Akka/Actor/ActorRef.Extensions.cs

What did these pages not make clear?
ActorRefExtensions.IsNobody logic clearly check if an ActorRef is invalid, but the documentation says the opposite.

An actorRef is thought to be invalid if it's one of the following: null, Nobody and DeadLetterActorRef.
Returns true if the actorRef is valid; otherwise false.

How can we do it better?
Inverting the returns part of the documentation:
Returns true if the actorRef is invalid; otherwise false.

[Aaronontheweb]

@aledefault yep, you're 100% right - that XML-DOC comment appears to have it backwards.