Merge branch '4.1'

* 4.1: CS fix [Debug] fix compat with PHP 7.3

Author: nicolas-grekas

XPath/Translator.php

@@ -84,7 +84,7 @@ public static function getXpathLiteral(string $element): string
  }
  }
 
- return sprintf('concat(%s)', implode($parts, ', '));
+ return sprintf('concat(%s)', implode(', ', $parts));
  }
 
  /**