`initialize` is sometimes called before initial attributes have been set about ampersand-state HOT 2 OPEN

initialize() {
    this.listenTo(this, 'change:myDependency', _.throttle(() => 
      this.expensiveProperty = this._calculateExpensiveProperty(), 1000));
},

set(...args) {
    Model.prototype.set.apply(this, args);

    const options = args[args.length - 1];
    if (options.initial) {
      this.set({ expensiveProperty: this._calculateExpensiveProperty() }, 
        { silent: true });
    }

    return this;
},