Knockout: Detatchable dependentObservable

detatchableObservable.js

// A dependentObservable that can be written to and reverted.
ko.detatchableDependentObservable = function(value, model) {
    var root_value = typeof value === 'function' ? ko.dependentObservable(value, model) : ko.observable(value);
    
    var public_value = ko.observable(root_value());
    root_value.subscribe(function(value){
        public_value(value);
    });
    
    var public_ = ko.dependentObservable({read: public_value, write: function(value){ public_.isConnected(false); public_value(value); }});
    public_.isConnected = ko.observable(true);
    public_.reconnect = function(){ this.isConnected(true); public_value(root_value()); };
    public_.disconnect = function(){ this.isConnected(false); };

    return public_;
};