TL;DR Ember added contains before it was slated for ES7. When the contains (now includes) spec did arrive, it was a bit of a problem that Ember was “squatting” the method name with a slightly different implementation. Fortunately, Ember had been designed to “eventually align” with javascript as it becomes more capable. Thus, this was the moment prototype extensions were retired as a default.
Created
November 1, 2017 09:50
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