proto-compute.js
function() {
			canReflect.onValue( observation, updater,"notify");
			if (observation.hasOwnProperty("_value")) {// can-observation 4.1+
				compute.value = observation._value;
			} else {// can-observation < 4.1
				compute.value = observation.value;
			}
		}
function() {
			canReflect.onValue( observation, updater,"notify");
			if (observation.hasOwnProperty("_value")) {// can-observation 4.1+
				compute.value = observation._value;
			} else {// can-observation < 4.1
				compute.value = observation.value;
			}
		}
function ( ) { canReflect . onValue ( observation , updater , "notify" ) ; if ( observation . hasOwnProperty ( "_value" ) ) { // can-observation 4.1+ compute . value = observation . _value ; } else { // can-observation < 4.1 compute . value = observation . value ; } }
Call `onchanged` when any source observables change.
Call onchanged when any source observables change .