A Story of Mysterious Asian Strings
summary
Asian scripts break assumptions: CJK use double-width glyphs so equal String.count can yield different visual widths (example: English "filter" counts 6 while a Japanese label showed 5 grapheme clusters yet took more space), Thai combining marks can overflow or clip UILabel tops, and some long composed Thai inputs once returned length 1 in a demo. Use grapheme-cluster counting (Swift String.count) for user-facing limits, avoid blocking IME composition and do not block composition—apply validation only after composition confirmation and normalize and measure rendered size.
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