Fix type hinting

Author: gertvdb

lib/i18n/sfNumberFormat.class.php

@@ -138,7 +138,7 @@ function format($number, $pattern = 'd', $currency = 'USD', $charset = null)
     ini_set('precision', $precision);
 
     list($number, $decimal) = $this->formatDecimal($string);
-    $integer = $this->formatInteger($this->fixFloat(abs($number)));
+    $integer = $this->formatInteger($this->fixFloat(abs((float)$number)));
 
     $result = (strlen($decimal) > 0) ? $integer.$decimal : $integer;