[Serializer] Remove private function

src/Symfony/Component/Serializer/Encoder/CsvEncoder.php

@@ -189,32 +189,12 @@ private function flatten(array $array, array &$result, $keySeparator, $parentKey
             if (\is_array($value)) {
                 $this->flatten($value, $result, $keySeparator, $parentKey.$key.$keySeparator);
             } else {
-                $result[$parentKey.$key] = $this->cleanValueByType($value);
+                // Ensures an actual value is used when dealing with true and false
+                $result[$parentKey.$key] = false === $value ? 0 : (true === $value ? 1 : $value);
             }
         }
     }
 
-    /**
-     * Ensures an actual value is used instead of a blank value when dealing
-     * with true and false.
-     *
-     * @param string $value
-     *
-     * @return int
-     */
-    private function cleanValueByType($value)
-    {
-        if (false === $value) {
-            return 0;
-        }
-
-        if (true === $value) {
-            return 1;
-        }
-
-        return $value;
-    }
-
     private function getCsvOptions(array $context)
     {
         $delimiter = isset($context[self::DELIMITER_KEY]) ? $context[self::DELIMITER_KEY] : $this->delimiter;