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Four Hidden Bugs That Break Software When Users Type Japanese

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A software developer has identified four recurring bug patterns that cause silent failures in code when users input Japanese or other CJK languages, even when all tests pass in English. The most common issue involves IME composition events, where web forms submit prematurely mid-conversion because keydown handlers do not check the isComposing flag. Other patterns include byte-level string slicing in languages like Go and Rust that corrupts multi-byte CJK characters, terminal tools miscalculating display width for double-width characters, and child processes losing locale settings and mangling Japanese text. The developer recommends searching merged pull requests in open-source repositories for keywords like isComposing or wcwidth to find related unfixed instances of the same bug. Effective fixes are described as small, well-referenced pull requests that link to the original patch and use real Japanese test strings rather than minimal single-character examples.

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Four Hidden Bugs That Break Software When Users Type Japanese · ShortSingh