A unique id to identify Units, Actions, Systems, Clusters.
It's required for a Unit to be persistent.
Note: If the provided id is not null or undefined, it should be a non-empty string, otherwise an error will be thrown.
A flag to control the replay behaviour of a Unit, System, Action or Cluster.
It decides whether the value should be replayed when you subscribe to the ActiveJS construct.
Common configuration options, applicable to all the fundamental ActiveJS constructs, Units, Systems, Action and Cluster.