Binding attr=null outputs attr="true"

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  value: null,
  actual: null,
  
  actions: {
    getActual() {
      this.set('actual', Ember.$('select option:first-child').val());
    }
  }
});

templates.application.hbs

<select>
  <option value="{{value}}">Null value?</option>
</select>

<button type="button" {{action "getActual"}}>Read Actual Value</button>

<p>Actual value: {{actual}}</p>

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "canary",
    "ember-data": "2.7.0",
    "ember-template-compiler": "canary"
  },
  "addons": {}
}