add PHPDocs for mixed params

Author: michalsn

system/Superglobals.php

@@ -64,6 +64,8 @@ public function __construct(
     /**
      * Get a value from $_SERVER.
      *
+     * @param server_items|null $default
+     *
      * @return server_items|null
      */
     public function server(string $key, mixed $default = null): array|float|int|string|null
@@ -114,6 +116,8 @@ public function setServerArray(array $array): void
     /**
      * Get a value from $_GET.
      *
+     * @param get_items|null $default
+     *
      * @return get_items|null
      */
     public function get(string $key, mixed $default = null): array|string|null
@@ -164,6 +168,8 @@ public function setGetArray(array $array): void
     /**
      * Get a value from $_POST.
      *
+     * @param post_items|null $default
+     *
      * @return post_items|null
      */
     public function post(string $key, mixed $default = null): array|string|null
@@ -214,6 +220,8 @@ public function setPostArray(array $array): void
     /**
      * Get a value from $_COOKIE.
      *
+     * @param cookie_items|null $default
+     *
      * @return cookie_items|null
      */
     public function cookie(string $key, mixed $default = null): array|string|null
@@ -264,6 +272,8 @@ public function setCookieArray(array $array): void
     /**
      * Get a value from $_REQUEST.
      *
+     * @param request_items|null $default
+     *
      * @return request_items|null
      */
     public function request(string $key, mixed $default = null): array|string|null