See State v. Fluhr, 287 N.W.2d 857, 869-70 (Iowa 1980) (dissenting opinion); State v. Reaves, 254 N.W.2d 488, 492 (Iowa 1977). We have come far. Notwithstanding our later retreat, see State v. Griffin, 238 N.W.2d 780, 781 (Iowa 1976), we at one time believed that a defendant should, at the very least, be required to claim innocence in order to set aside a guilty plea. State v. Whitehead, 163 N.W.2d 899, 903 (Iowa 1969).