According to the Backbone.js docs ____ The *changed* property is the internal hash containing all the attributes that have changed since the last set. Please do not update *changed* directly since its state is internally maintained by set. A copy of *changed* can be acquired from changedAttributes. ____ The ``++changed++`` property is involved in decisions about whether or not a collection should be resorted when it is updated. If you modify it manually, you can break the resorting of the collection. == Noncompliant Code Example ---- myModel.changed = { myProperty: 1 }; // Non-compliant ---- ifdef::env-github,rspecator-view[] ''' == Comments And Links (visible only on this page) include::comments-and-links.adoc[] endif::env-github,rspecator-view[]