Network.IDN.blacklist chars
[1]. http://www.unicode.org/reports/tr24/#Spoofing [2]. https://archive.icann.org/zh/topics/new-gtlds/update-dns-stability-18feb09-zh.pdf [3]. https://www.icann.org/resources/unthemed-pages/idn-guidelines-2006-02-22-en [4]. http://www.unicode.org/reports/tr36/ [5]. http://www.unicode.org/faq/security.html [6]. http://kb.mozillazine.org/Network.IDN.blacklist_chars