all ok, no details:
string(22) "www.xn--fuball-cta.com"
all ok, no details, transitional:
string(16) "www.fussball.com"
all ok, with details:
string(22) "www.xn--fuball-cta.com"
array(3) {
  ["result"]=>
  string(22) "www.xn--fuball-cta.com"
  ["isTransitionalDifferent"]=>
  int(1)
  ["errors"]=>
  int(0)
}
reverse, ok, with details:
string(16) "www.fußball.com"
array(3) {
  ["result"]=>
  string(16) "www.fußball.com"
  ["isTransitionalDifferent"]=>
  int(0)
  ["errors"]=>
  int(0)
}