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This PR tries to make lud-16 more explicit and leave less open questions.
Until now the PR linked to the static internet identifier spec, but at the same time defined rules for the that are not part of the internet identifier spec. This is okay, but I think it is good to make this really clear, that the username spec is more strict than the common internet identifier spec. That's why I added a sentence there.
Further more I added that if the SERVICE does not find the identifier, it MUST throw an error. I added this because already in first tests I could see SERVICES implement it differently, one throws an error, the other doesn't.
And lastly I capitalized some MUSTS