This kind of question, minute in scope yet extremely important in textual and critical research, is often overlooked by scholars who, even if they come to think of it, usually leave it unsettled for lack of a means to find an answer.
這麼一個瑣細、卻對考據書籍版本及學術流布極為重要的問題，常被一般學者忽略；就算有人想到了，也往往因為無處找答案而不了了之。