Basically, this works:

  my $foo = $r->bridge('/foo')
  my $f2 = $foo->get('/')->to('controller' => 'example', action => 'foo');

But this doesn't:

  my $foo = $r->bridge('/foo')->to(controller => 'example');
  my $f2 = $foo->get('/')->to('controller' => 'example', action => 'foo');

Why does tacking on the ->to to the bridge (in an attempt to default the controller to 'example') cause the route to fail? Output of morbo routes is identical.