fsdbm_has_value  1062 ext/sdbm/init.c     rb_define_method(rb_cDBM, "has_value?", fsdbm_has_value, 1);
fsdbm_has_value  1063 ext/sdbm/init.c     rb_define_method(rb_cDBM, "value?", fsdbm_has_value, 1);