Maybe it's referring specifically to the "new" keyword that can cause issues if left out when creating instances. If you look at the code, Spine uses Object.cre

Maybe it's referring specifically to the "new" keyword that can cause issues if left out when creating instances. If you look at the code, Spine uses Object.create(this.prototype) for init. This article is a great explanation on issues with prototypal inheritance http://howtonode.org/prototypical-inheritance http://howtonode.org/prototypical-inheritance