SCM_CLASS_NDBM     25 ext/dbm/ndbm.c  #define SCM_NDBMP(obj)       SCM_XTYPEP(obj, SCM_CLASS_NDBM)
SCM_CLASS_NDBM     93 ext/dbm/ndbm.c   SCM_SET_CLASS(z, SCM_CLASS_NDBM);