title: json data value type
body: <p>I want to change json array values from strings to float values which from php script. It's all string type. I want it as a float type.</p>
  
  <pre><code>[{"year":"2008","value":"4169.20"},
  {"year":"2009","value":"4067.50"},
  {"year":"2010","value":"4848.40"},
  {"year":"2011","value":"5654.80"},
  {"year":"2012","value":"6071.50"}]
  </code></pre>
  
  <p>But i want it to look like. Is it possible?</p>
  
  <pre><code>[{"year":"2008","value":4169.20},
  {"year":"2009","value":4067.50},
  {"year":"2010","value":4848.40},
  {"year":"2011","value":5654.80},
  {"year":"2012","value":6071.50}]
  </code></pre>