Even more dispositive of the argument are our opinions in State v. Boushee, 284 N.W.2d 423, 434 (N.D. 1979) (a defendant is not entitled, before taking the witness stand, to a ruling on admissibility of his prior felony convictions), and State v. Johnson, 231 N.W.2d 180, 184 (N.D. 1975) (defendants taking the witness stand may be cross-examined as to matters which tend to degrade them, including p