Boolean String Bug

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  queryParams: ["redevelopment"],
  redevelopment: null,
  actions: {
    toggleIt: function() {
      var value = this.get("redevelopment");
      this.toggleProperty("redevelopment");
      this.set("typeof", typeof value);
    }
  }
});

templates.application.hbs

Controller property as query parameter:
<br/>
<button{{action "toggleIt"}}>Click This</button>
<br />
Value: {{this.redevelopment}} <br />
Typeof: {{this.typeof}}

twiddle.json

{
  "version": "0.9.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.0",
    "ember-template-compiler": "2.6.0"
  }
}