A parent breaking what it declared of a child, raised as it happens (in update, makeModel, subscriptions
or runCommand, which the run then dies in): an external message to a child that is not there, or that
rejects it; the model of a child that is not there; an event, a command or a subscription key that nothing
handles. child names the child, and id its id for a child by id.
A parent breaking what it declared of a child, raised as it happens (in
update,makeModel,subscriptionsorrunCommand, which the run then dies in): an external message to a child that is not there, or that rejects it; the model of a child that is not there; an event, a command or a subscription key that nothing handles.childnames the child, andidits id for a child by id.