An action a policy has wrapped.
It is an Action, which is what lets policies nest, but its signal is optional: the outermost call has no policy above it to supply one, and an action always receives a real signal from the policy that calls it.
Optional
An action a policy has wrapped.
It is an Action, which is what lets policies nest, but its signal is optional: the outermost call has no policy above it to supply one, and an action always receives a real signal from the policy that calls it.