title: problem with floating values
body: <p>I ve got a strange php behaviour with floating value</p>
  
  <pre><code>$array_test["test"]= round($value,2); //first I round up a value
  echo $array_test["test"]; //0,66
  $s_array_test= serialize($array_test); //serializing the array
  var_dump($s_array_test) // (...)s:4:"test";d:0.66000000000000003108624468950438313186168670654296875;}(...)
  </code></pre>
  
  <p>This is pretty annoying cause the serialized array is stored into a db a use more space...</p>
  
  <p>How to fix this ?</p>
  
  <p>thx</p>