Function cjk::is_cjk_codepoint

pub fn is_cjk_codepoint(c: char) -> bool

is_cjk_codepoint returns true if the character falls within the CJK unicode block. The CJK unicode block does not contain all chinese, japanese, korean, or vietnamese characters.

Despite this shortcoming, this utility is widely used and we provide it here for applications that expect it.