downgrade to kirby v3

kirby/src/Http/Idn.php

@@ -17,22 +17,31 @@ class Idn
 {
 	/**
 	 * Convert domain name from IDNA ASCII to Unicode
+	 *
+	 * @param string $domain
+	 * @return string|false
 	 */
-	public static function decode(string $domain): string|false
+	public static function decode(string $domain)
 	{
 		return idn_to_utf8($domain);
 	}
 
 	/**
 	 * Convert domain name to IDNA ASCII form
+	 *
+	 * @param string $domain
+	 * @return string|false
 	 */
-	public static function encode(string $domain): string|false
+	public static function encode(string $domain)
 	{
 		return idn_to_ascii($domain);
 	}
 
 	/**
 	 * Decodes a email address to the Unicode format
+	 *
+	 * @param string $email
+	 * @return string
 	 */
 	public static function decodeEmail(string $email): string
 	{
@@ -48,6 +57,9 @@ class Idn
 
 	/**
 	 * Encodes a email address to the Punycode format
+	 *
+	 * @param string $email
+	 * @return string
 	 */
 	public static function encodeEmail(string $email): string
 	{