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<!-- EMBER_CLI_FASTBOOT_TITLE -->  <meta name="ember-cli-head-start" content>  <title>Disabling Prototype Extensions - Configuring Ember.js - Ember Guides</title>

  <meta name="description" content="By default, Ember.js will extend the prototypes of native JavaScript objects in the following ways: 

- Array is extended to implement the Ember.Enumerable, Ember.MutableEnumerable, Ember.