A refusal of a send the mesh never recorded went only to stderr; it is now kept with its sender said to be unknown, and raised. A counter behind the machine (a store put back) is raised and the condition names push, since the receive loop must not push. The node's digest and generation are one transaction, and a send record that fails is said loudly without failing the send. The trigger ignores an update that changes nothing, and the put-back mark is dropped: a put-back is composed afresh with the current generation.