CodeIgniter 4 Pre-Alpha 1: Obfuscated IDs and routing

In CodeIgniter 4 Pre-Alpha 1 there is built-in feature for obfuscating ID's that is managed by the sort of "mini-AR" for models. So, this is and example from the documentation:

Code:

// Creates something like: http://exmample.com/users/MTIz
$url = '/users/'. $model->encodeID($user->id);

I think, there should be introduced a placeholder (a named sub-pattern) within the router that is to recognize the corresponding hashes. currently there are these placeholders:
(:any)
(:segment)
(:num)
(:alpha)
(:alphanum)

If the format of the resulting hash makes possible it to be distinguished with reliability then a new placeholder for routing patterns can be introduced, (:hash) or with similar name.