can-bind.js
function() {
		if (this._bindingState.parent === false && this._parentToChild === true) {
			var options = this._options;
			this._bindingState.parent = true;
			turnOnListeningAndUpdate(options.parent, options.child, this._updateChild, options.queue);
		}
	}
function() {
		if (this._bindingState.parent === false && this._parentToChild === true) {
			var options = this._options;
			this._bindingState.parent = true;
			turnOnListeningAndUpdate(options.parent, options.child, this._updateChild, options.queue);
		}
	}
function ( ) { if ( this . _bindingState . parent === false && this . _parentToChild === true ) { var options = this . _options ; this . _bindingState . parent = true ; turnOnListeningAndUpdate ( options . parent , options . child , this . _updateChild , options . queue ) ; } }
Listen for changes to the parent observable and update the child
Listen for changes to the parent observable and update the child