// 易错点4：条件写成"<"而非"<="，会导致相同值的元素被错误保留
原文来自:http://blog.daimajiangxin.com.cn
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Users do not control the font. A content moderator reviewing flagged usernames sees whatever font the moderation tool renders. If that tool uses a system sans-serif (Arial, Helvetica, San Francisco), Cyrillic homoglyphs are invisible. If it used Zapfino, every pair would look different. The font is an uncontrolled variable in every visual review process.
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