[Intl] Narrower type

derrabus · derrabus · commit 1991bb88923e · 2021-09-08T16:42:16.000+02:00
Signed-off-by: Alexander M. Turek &lt;me@derrabus.de&gt;
diff --git a/Intl.php b/Intl.php
@@ -54,7 +54,7 @@ final class Intl
      */
     public const TIMEZONE_DIR = 'timezones';
 
-    private static string|bool|null $icuVersion = false;
+    private static string|false|null $icuVersion = false;
     private static string $icuDataVersion;
 
     /**
