As I understand it, the printers often ran out of certain words or letters they had often packed into a "cliche". . .this is the original meaning of the term cliche. . .and thus, being unwilling to unpack the cliches, and thus you will see some substitutions that look very odd. . .such as the exchanges of u for v, v for u, above. . .and you may wonder why they did it this way, presuming Shakespeare did not actually write the play in this manner. . . .