RFC 3490, "Internationalizing Domain Names in Applications (IDNA)", March 2003Source of RFC: idn (int)
See Also: RFC 3490 w/ inline errata
Errata ID: 266
Publication Format(s) : TEXT
Reported By: Adam Costello
Date Reported: 2003-04-28
Section 4.2 says:
The ToUnicode output never contains more code points than its input. This is not true; I have constructed a counterexample.
It should say:
The Punycode decoder can never output more code points than it inputs, but Nameprep can, and therefore ToUnicode can.