dataSource.set using fluid.promise.follow

kettle.dataSource.set

    kettle.dataSource.set = function (that, directModel, model, options) {
        options = kettle.dataSource.defaultiseOptions(options, directModel, true); // shared and writeable between all participants
        var transformPromise = fluid.fireTransformEvent(that.events.onWrite, model, options);
        var togo = fluid.promise();
        transformPromise.then(function (transformed) {
            var innerPromise = thet.setImpl(options, directModel, transformed);
            fluid.promise.follow(innerPromise, togo); 
        });
        kettle.dataSource.registerStandardPromiseHandlers(that, togo, options);
        return togo;
    };