Merge branch '4.4' into 5.2

* 4.4:
  Move github templates at the org level
  [Cache] Fix Redis TLS scheme `rediss` for Redis connection
  In calls to mb_ functions, silently transform arg into string

Helper/Helper.php

@@ -45,6 +45,8 @@ public function getHelperSet()
      */
     public static function strlen(?string $string)
     {
+        $string = (string) $string;
+
         if (false === $encoding = mb_detect_encoding($string, null, true)) {
             return \strlen($string);
         }
@@ -59,6 +61,8 @@ public static function strlen(?string $string)
      */
     public static function substr(string $string, int $from, int $length = null)
     {
+        $string = (string) $string;
+
         if (false === $encoding = mb_detect_encoding($string, null, true)) {
             return substr($string, $from, $length);
         }