Checkbox Focus test

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Checkbox focus test',
  
  actions: {
  	focusInAction() {
      let args = Array.from(arguments)
      let alerts = this.get('alerts');
    	this.set('alerts', alerts + '\nFocused: ' + args.join(', '));
      console.log(args, arguments);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
For checkboxes <code>focus-in</code> doesn't work:
<br>
<label>
	{{input type="checkbox" focus-in=(action 'focusInAction')}}
  focus-in checkbox
</label>
<br>
<br>
but <code>focusIn</code> does:
<br>
<label>
	{{input type="checkbox" focusIn=(action 'focusInAction')}}
  focusIn checkbox
</label>
<br>
<br>
For text inputs, however, both work:
<br>
<label>
	{{input type="text" focus-in=(action 'focusInAction')}}
  focus-in text input
</label>
<br>
<br>
<label>
	{{input type="text" focusIn=(action 'focusInAction')}}
  focusIn text input
</label>
<br>
Note, though, that argument passed to the handlers is different (current value vs jquery event; details in the console):

<pre>
{{alerts}}
</pre>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}