title: Django initial data serialization error
body: <p>I am trying to provide initial data for a model in Django. but when i try to run <code>python manage.py loaddata &lt;fixture path&gt;</code> I get the following error:  </p>
  
  <pre><code>django.core.serializers.base.DeserializationError: Problem installing 
  fixture '/home/location/fixtures/initial_data.json': 
  Expecting property name enclosed in double quotes: line 7 column 10 (char 119)
  </code></pre>
  
  <p>My fixtures or initial data is like this:  </p>
  
  <pre><code>[
  {
      "model": "location.zipcode",
      "pk": 1,
      "fields": {
        "zipcode": 79936,
       }
  },
  {
      "model": "location.zipcode",
      "pk": 2,
      "fields": {
          "zipcode": 90011,
      }
  }
  ]
  </code></pre>
  
  <p>I have <code>zipcode</code> as an IntegerField in Zipcode model.
  Help will be appreciated.</p>