fdbm_has_value   1090 ext/dbm/dbm.c      rb_define_method(rb_cDBM, "has_value?", fdbm_has_value, 1);
fdbm_has_value   1092 ext/dbm/dbm.c      rb_define_method(rb_cDBM, "value?", fdbm_has_value, 1);