Kana / romaji
JS
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Romaji conversion drops the z in づ (outputs u instead of zu)
Romanize づ as zu (the consonant was being dropped)
kana-romaji · mtomim/kana-romaji
Symptom
kana-romaji library drops the 'z' consonant when romanizing づ, outputting 'u' instead of 'zu'.
Minimal repro
romanize('づ') returns 'u' instead of 'zu'.
Fix
づ should romanize as 'zu' (Hepburn). Map づ→zu in the kana table.