Parameter config_dir_purge does not work as expected

[robbevl]

From REFERENCE.md:

config_dir_purge
Data type: Boolean

Determines if unmanaged configuration files should be removed.

Default value: false

Expected: setting this to true will remove unmanaged files from my jail.d directory
What actually happens: Nothing

Reason:

From config.pp:

  file { 'fail2ban.dir':
    ensure  => $fail2ban::config_dir_ensure,
    path    => $fail2ban::config_dir_path,
    force   => $fail2ban::config_dir_purge,
    notify  => $fail2ban::config_file_notify,
    require => $fail2ban::config_file_require,
  }

It seems, when package_ensure is "purged", config_dir_purge will make sure the config directory (/etc/fail2ban) is removed.
But it does not purge unmanaged configuration files, so it seems the documentation is misleading here.