title: Google Tag Manager mobile variables corrupted
body: <p>When I create a user-defined variable I have problems with the JSON formatting</p>
  
  <pre><code>{
  "banner": {
      "bannerAdsEnabled": true,
      "bannerAdLocationTop": false
  },
  "interstitial": {
      "interstitialAdsEnabled": true,
      "maxInterstitialsPerDay": 10,
  }}
  </code></pre>
  
  <p>When I do it this way I always get</p>
  
  <blockquote>
    <p>GoogleTagManager error: Invalid macro:
    GoogleTagManager error: Failed to parse an invalid boolean:</p>
  </blockquote>
  
  <p>The only solution I found is to format my variable as follows:</p>
  
  <pre><code>{
    "bannerAdsEnabled": true,
    "bannerAdLocationTop": false,
    "interstitialAdsEnabled": true,
    "maxInterstitialsPerDay": 10 }
  </code></pre>
  
  <p>I a <a href="https://youtu.be/Xe8W5w68BRg?t=364" rel="nofollow">video from Google I/O '13</a> the guy is formatting the the way I want to do it and it is working. What am I doing wrong?</p>