Unicode edge cases for text handling
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Accents        : café naïve Zoë Ångström
CJK            : 東京 北京 서울
RTL            : مرحبا שלום
Emoji          : 🌲🪵 👩🏽‍💻 👨‍👩‍👧‍👦
Combining      : é (e + acute) vs é (precomposed)
Zero-width     : a​b (zero-width space between a and b)
RTL override   : ‮txet desrever‬
Astral plane   : 𝕋𝕖𝕤𝕥 𝐁𝐨𝐥𝐝
Nul-adjacent   : tab	here, newline follows
Long grapheme  : 🏳️‍🌈 (6 codepoints, 1 grapheme)