Reviewed and tested the patch provided in #47
- The Module is not yet compati...

Reviewed and tested the patch provided in #47
- The Module is not yet compatible with D10, the test composer was failing due to that.
- Works with 9.4 PHP 8.0 & MySQL 5.7, D9.4 6 pass

Additional The patch required the
$settings['fast404_respect_redirect'] = TRUE;
to be set in the settings.fast404.php file

It would be best to include comment and variable in the example.settings.fast404.php file

Results
Without the patch
- Navigating to /about-us will not redirect but go into fast404 page.

With the patch
$settings['fast404_respect_redirect'] = TRUE;
- Navigating to /about-us shall redirect normally to /about-you.
$settings['fast404_respect_redirect'] = FALSE;
- Navigating to /about-us will not redirect but go into fast404 page.