Enabled: When a valueGuard doesn't succeed by itself at coercing an object,
the valueGuard may enlists the object's aid in bring about a coercion
it would find acceptable.
Enabled: When someone was holding a partitionable eventual reference to this
object, and it sufferes a partition, then this object is informed that
one of its clients may no longer be able to talk to it, and why.
Enabled: Notification that some client of this object may no longer be able to
talk to it, presumably because of a Partition whose case is described
by 'problem'.