Nameprep

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Nameprep is the process of Unicode NFKC normalization, case-folding, mapping lookalike characters together, and elimination of restricted codepoints applied to text before it is suitable to represent a domain name, or other such canonical name.

Nameprep is defined in RFC 3491, "Nameprep: A Stringprep Profile for Internationalized Domain Names (IDN)", as a profile of Stringprep, which is described in RFC 3454, "Preparation of Internationalized Strings ("stringprep")."

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