East Asian line breaking rules.

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In major East Asian languages, particularly Chinese languages, Japanese, and Korean, there are standard rules for line breaking that are expected to be followed.

In Japanese, one subset of these rules is called 禁則処理 [kinsoku shori], and it is standardized in JIS X 4051. It essentially says that there are certain classes of character (usually punctuation, or kana that modify a previous kana to form a single mora e.g. the ョ in ギョ) that are not permitted at the end or the beginning of a line, such that a necessary line break should be moved to a previous or subsequent† non-prohibited character to prevent this.

There are standardized ways for doing something similar with Chinese languages, with some local variation between regions and specific languages.

In Korean, there are again similar rules.

† this may require negative tracking, smooshing characters together, which is common in high quality East Asian typesetting.

Start by reviewing the issue's references to Japanese kinsoku shori and JIS X 4051, alongside the stated Chinese and Korean requirements. The payload names no implementation file, entry point, or test, so the work would first need a project-specific line-breaking location and testable scope; done would mean the agreed East Asian rules are handled consistently.

Written by the indexing model from the issue text.