fgdbm_has_value  1223 ext/gdbm/gdbm.c     rb_define_method(rb_cGDBM, "has_value?", fgdbm_has_value, 1);
fgdbm_has_value  1225 ext/gdbm/gdbm.c     rb_define_method(rb_cGDBM, "value?", fgdbm_has_value, 1);