Component Subexpressions one-way by default?

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  optionList: {
    changePercentage: {
      type: 'input',
      value: 10
    },
    duration: {
      type: 'input',
      value: '60s'
    }
  }
});

application.template.hbs

{{#each-in optionList as |id obj|}}
  {{component 'x-thing' id=id obj=obj}}
  Value outside: {{obj.value}}
  <br>
  <br>
{{/each-in}}

tests.helpers.destroy-app.js

import Ember from 'ember';

export default function destroyApp(application) {
  Ember.run(application, 'destroy');
}

tests.helpers.resolver.js

import Resolver from '../../resolver';
import config from '../../config/environment';

const resolver = Resolver.create();

resolver.namespace = {
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix
};

export default resolver;

tests.helpers.start-app.js

import Ember from 'ember';
import Application from '../../app';
import config from '../../config/environment';

const { run } = Ember;
const assign = Ember.assign || Ember.merge;

export default function startApp(attrs) {
  let application;

  let attributes = assign({rootElement: "#test-root"}, config.APP);
  attributes = assign(attributes, attrs); // use defaults, but you can override;

  run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.test-helper.js

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';

setResolver(resolver);

twiddle.json

{
  "version": "0.6.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.1",
    "ember-data": "release",
    "ember-template-compiler": "2.9.1"
  }
}

x-thing.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  label: Ember.computed('id', function() {
  	var text = this.get('id');
    var result = text.replace( /([A-Z])/g, " $1" );
    return result.charAt(0).toUpperCase() + result.slice(1);
  })
});

x-thing.template.hbs

<label>
  <strong>{{label}}</strong> 
  {{input value=obj.value}}</label>
<br>Val in component: {{obj.value}}