commit e54a914e4c86862f31e01d2d816ec66d9cac3157
Author: Erik Stielstra <info@erikstielstra.nl>
Date:   Wed Jun 26 11:39:42 2013 +0100

    #26

diff --git a/core/lib/Drupal/Component/Gettext/PoHeader.php b/core/lib/Drupal/Component/Gettext/PoHeader.php
index d5ad380..6a491f3 100644
--- a/core/lib/Drupal/Component/Gettext/PoHeader.php
+++ b/core/lib/Drupal/Component/Gettext/PoHeader.php
@@ -513,6 +513,6 @@ protected function evaluatePlural($element_stack, $n) {
         }
       }
     }
-    return $element_stack[0];
+    return (int) $element_stack[0];
   }
 }
diff --git a/core/modules/locale/lib/Drupal/locale/PoDatabaseWriter.php b/core/modules/locale/lib/Drupal/locale/PoDatabaseWriter.php
index eebf85a..4ac4a89f 100644
--- a/core/modules/locale/lib/Drupal/locale/PoDatabaseWriter.php
+++ b/core/modules/locale/lib/Drupal/locale/PoDatabaseWriter.php
@@ -178,7 +178,7 @@ function setHeader(PoHeader $header) {
         list($nplurals, $formula) = $p;
         $locale_plurals[$langcode] = array(
           'plurals' => $nplurals,
-          'formula' =>  serialize($formula),
+          'formula' =>  $formula,
         );
         \Drupal::state()->set('locale.translation.plurals', $locale_plurals);
       }