fix: curl request crashes with params that give an int once hexed. (c…

…odeigniter4#9198)

* fix: handle hex2bin() function input.

* docs: add a comment out.

system/HTTP/URI.php

@@ -1177,7 +1177,8 @@ protected function parseStr(string $query): array
         parse_str($params, $result);
 
         foreach ($result as $key => $value) {
-            $return[hex2bin($key)] = $value;
+            // Array key might be int
+            $return[hex2bin((string) $key)] = $value;
         }
 
         return $return;