intersect bug

controllers.application.js

import Ember from 'ember';

let objA = {name: 'pojoA'};
let objB = {name: 'pojoB'};
let objC = {name: 'pojoC'};
let objD = {name: 'pojoD'};
let objE = {name: 'pojoE'};

let notBrokenIntersect = (keyOne, keyTwo) => Ember.computed(`${keyOne}.[]`, `${keyTwo}.[]`, function() {
  let arrayTwo = this.get(keyTwo);

  return this.get(keyOne).reduce((memo, item) => {
    if (arrayTwo.includes(item)) {
      memo.push(item);
    }
    return memo;
  }, []);
});

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  someActors: Ember.computed('model', function() {
  	return this.get('model').slice(0,2);
	}),
  intersectActors: notBrokenIntersect('model', 'someActors'),

  diffActors: Ember.computed.setDiff('model', 'someActors'),
  
  pojoArr1: [objA, objB, objC, objD, objE],
  pojoArr2: [objA, objB],
  intersectPojos: Ember.computed.intersect('pojoArr1', 'pojoArr2'),
  diffPojos: Ember.computed.setDiff('pojoArr1', 'pojoArr2')
});

models.actor.js

import Model from "ember-data/model";
import attr from "ember-data/attr";
import { belongsTo, hasMany } from "ember-data/relationships";

export default Model.extend({
  name: attr('string')
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel() {
    this.store.push({
      data: [
        // an array of records
        {
          id: '1',
          type: 'actor',
          attributes: {
            name: 'actor1'
          }
        },
        {
          id: '2',
          type: 'actor',
          attributes: {
            name: 'actor2',
          }
        },
        {
          id: '3',
          type: 'actor',
          attributes: {
            name: 'actor3',
          }
        },
        {
          id: '4',
          type: 'actor',
          attributes: {
            name: 'actor4',
          }
        },
        {
          id: '5',
          type: 'actor',
          attributes: {
            name: 'actor5',
          }
        },
      ]
    });
  },
  
  model() {
  	return this.store.peekAll('actor');
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}

All Actors:
{{#each model as |actor|}}
	{{actor.name}}
{{/each}}
<br>
Some Actors:
{{#each someActors as |actor|}}
	{{actor.name}}
{{/each}}
<br>
Intersect Actors:
{{#each intersectActors as |actor|}}
	{{actor.name}}
{{/each}}
<br>
Diff Actors:
{{#each diffActors as |actor|}}
	{{actor.name}}
{{/each}}
<br><br><br>

All Pojos:
{{#each pojoArr1 as |pojo|}}
	{{pojo.name}}
{{/each}}
<br>
Some Pojos:
{{#each pojoArr2 as |pojo|}}
	{{pojo.name}}
{{/each}}
<br>
Intersect Pojos:
{{#each intersectPojos as |pojo|}}
	{{pojo.name}}
{{/each}}
<br>
Diff Pojos:
{{#each diffPojos as |pojo|}}
	{{pojo.name}}
{{/each}}
<br>

twiddle.json

{
  "version": "0.10.7",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.1",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.1",
    "ember-testing": "2.9.1"
  },
  "addons": {}
}