(unboundedMailbox: StringAdd).self
(unboundedMailbox: StringFormat).self
(unboundedMailbox: ArrowAssoc[UnboundedMailbox]).x
(Since version 2.10.0) Use leftOfArrow
instead
(unboundedMailbox: Ensuring[UnboundedMailbox]).x
(Since version 2.10.0) Use resultOfEnsuring
instead
UnboundedMailbox is the default unbounded MailboxType used by Akka Actors.