• [code quality] Combine the Validate and PositionMovable in the CaretPositionAlgorithm #2020
• [enhancement] Think about how pass the start and end index into the IIndexCaretPositionAlgorithm #2019
• [code quality] Separate the base class for those "lyric index" based caret position algorithm #2017
• [enhancement] Ruby/Romaji's index should be char index #2009
• [code quality] Remove all aaa.invoke() usage. #2006