An editing question

Professor Barnet noted that in Act 1, scene 7, Mac says: "Prithee, peace! / I dare do all that may become a man; / Who dares no more is none." He goes on to inform us that since the time of Samuel Johnson, editors have replaced "no" with "do:" "Who dares do more is none." It seems to me that Barnet chose this passage as an example because he found it interesting. It also seems that Macbeth is

An editing question