extra property
4 var to control connectors state, working-condition-state values. howTo Null static Map or final
Implementation
final Map<String, int> extra = {
// static Map<String, int> extra = {
'init': 0,
/// NOTE: init-build-roll calls are not yet orderly planned in 0.0.7.
'build': 0,
'roll': 0,
'flux': 0, // #say flow, aso: bind-bing & 12 others flow.
};