Here are the rules for the .sa TLD https://www.iana.org/domains/idn-tables/tables/man_ar_1.0.txt https://www.iana.org/domains/idn-tables/tables/man_ar_1.0.tx...

Here are the rules for the .sa TLD https://www.iana.org/domains/idn-tables/tables/man_ar_1.0.txt https://www.iana.org/domains/idn-tables/tables/man_ar_1.0.tx... I suppose other TLDs could have different rules. But in general you'd want to have a canonicalization step so you don't have two domains that are just different ways of composing the same thing.