title: Footable does not sort by data-type = "number" using CodeIgniter and JSON
body: <p>I am new using Footable and I cant sort by data-type="number" (Everything else works correctly).</p>
  
  <p>My Footable Code is:
  `</p>
  
  <pre><code>&lt;table
  id="tabla"
  class="table table-striped table-bordered"
  data-paging="true"
  data-paging-count-format="{CP} de {TP}"
  data-sorting="true"
  data-filtering="true"
  data-filter-connectors="true"
  data-filter-delay="-1"
  data-filter-min="0"
  data-filter-placeholder="Buscar"
  data-empty="Sin resultados"
  data-show-toggle="false"
  data-toogle="true"
  &gt;
  &lt;thead id="thead"&gt;&lt;tr&gt;
  &lt;td data-name="fila" data-title="#" data-type="number" data-sorted="true"&gt;&lt;/td&gt;
  &lt;td data-name="id" data-title="ID" data-type="number"&gt;&lt;/td&gt;
  &lt;td data-name="numero" data-type="number" data-title="Nro."&gt;&lt;/td&gt;
  &lt;td data-name="descripcion" data-title="Descripcion" breakpoints="xs sm"&gt;&lt;/td&gt;
  &lt;td data-name="ciudad" data-title="Ciudad" data-formatter="vinchuca"&gt;&lt;/td&gt;
  &lt;td data-title="Acciones" data-formatter="acciones"&gt;&lt;/td&gt;
  &lt;/tr&gt;&lt;/thead&gt;
  &lt;/table&gt;
  
  &lt;script&gt;
      $.get(baseurl+"ABM/readTodo",function(data){
          futable = FooTable.init('#tabla',{
          "rows":JSON.parse(data)
          });
      })
  &lt;/script&gt;
  </code></pre>
  
  <p>`</p>
  
  <p><a href="https://i.stack.imgur.com/Dftnv.png" rel="nofollow noreferrer">Graphic example of my problem</a></p>
  
  <p>the codeIgniter JSON output is:</p>
  
  <pre><code>   "rows":[{"fila":"1","id":"1","numero":"1","descripcion":"pruebas","idCiudad":"2","ciudad":"LORETO"},{"fila":"2","id":"2","numero":"2","descripcion":"esta es la segundas","idCiudad":"2","ciudad":"LORETO"},{"fila":"3","id":"3","numero":"4","descripcion":"ESTA ES OTRA TABLA","idCiudad":"2","ciudad":"LORETO"},{"fila":"4","id":"4","numero":"20","descripcion":"ESTA ES LA ULTIMA","idCiudad":"1","ciudad":"SANTIAGO DEL ESTERO"}]
      });
  </code></pre>
  
  <p>if I remove the "" like this:
  "fila":1,"id":1,"numero":1,"descripcion":"pruebas","idCiudad":"2","ciudad":"LORETO"}</p>
  
  <p>Footable works, what can i do?</p>