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I think that some key values for IME are duplicated. There are Hiragana, Katakana and RomanCharacters. However, there are also JapaneseHiragana, JapaneseKatakana and JapaneseRomaji. I think that "Japanese" prefix isn't necessary. So, I'd like to suggest that the latter names should be removed.
Agree.
Updated in the latest editor's draft. Thanks!