docs: function deprecateProperty(object, deprecatedKey, newKey) {
        function deprecate() {
          Ember.deprecate('Usage of `' + deprecatedKey + '` is deprecated, use `' + newKey + '` instead.');
        }
  
        if (hasPropertyAccessors) {
          defineProperty(object, deprecatedKey, {
              configurable: true,
              enumerable: false,
              set: function(value) { deprecate(); set(this, newKey, value); },
              get: function() { deprecate(); return get(this, newKey); }
          });
        }
      }