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[BUG][CANARY] Mixins throwing object is not extensible #16479

@kiwiupover

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@kiwiupover

Both addon are throwing TypeError: Cannot add property undefined, object is not extensible
https://github.com/offirgolan/ember-cp-validations/blob/master/addon/validations/factory.js#L146
https://github.com/offirgolan/ember-parachute/blob/master/addon/query-params.js#L293

ValidationsMixin[Ember.NAME_KEY] = 'Validations';
Ember.NAME_KEY is undefined
ValidationsMixin seems to be immutable

Addons using Ember.NAME_KEY
https://emberobserver.com/code-search?codeQuery=NAME_KEY&sort=score&sortAscending=false

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