According to the Backbone.js docs

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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.
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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

[source,javascript]
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myModel.changed = { myProperty: 1 }; // Non-compliant
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== Implementation Specification
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== Comments And Links
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