drupal_link doesn't accept uri

So, What I'd like to work is this:

{{ drupal_link('learn more', node.field_file_url|file_uri) }}

As a workaround, I can use file_url but given a uri like private://foo/bar.png it doesn't seem possible to use drupal_link.

This is caused by this fairly reasonable safeguard working under the assumption that the link being provided is user input and not system data :-/

    if (!in_array($user_input[0], ['/', '#', '?'])) {
      $user_input = '/' . $user_input;
    }