If you haven't been following Ember.js & Glimmer closely
here are 5 things to know about the change: http://madhatted.com/2016/11/30/5-things-to-know-about-ember-2-10-and-glimmer-2 … 
We were never able to define what the old behavior even was (it changed a lot between 1.0 and 2.8).
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The original deprecation was sloppy about what it would mean to continue supporting it until 3.0.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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