Remove some unused variables and properties

Author: tgalopin

Extension/Core/DataTransformer/DateIntervalToStringTransformer.php

@@ -23,20 +23,17 @@
 class DateIntervalToStringTransformer implements DataTransformerInterface
 {
     private $format;
-    private $parseSigned;
 
     /**
      * Transforms a \DateInterval instance to a string.
      *
      * @see \DateInterval::format() for supported formats
      *
-     * @param string $format      The date format
-     * @param bool   $parseSigned Whether to parse as a signed interval
+     * @param string $format The date format
      */
-    public function __construct($format = 'P%yY%mM%dDT%hH%iM%sS', $parseSigned = false)
+    public function __construct($format = 'P%yY%mM%dDT%hH%iM%sS')
     {
         $this->format = $format;
-        $this->parseSigned = $parseSigned;
     }
 
     /**