geometry function equals hangs forever

drop table if exists t1;

create table t1(a geometry not null)engine=myisam;

insert into t1 values(geomfromtext("POINT(0 0)"));

insert into t1 values(geomfromtext("POINT(0 9.2233720368548e18)"));

insert into t1 values(geomfromtext("POINT(0 9.2233720368548e18)"));

select equals(`a`,convert(`a` using utf8)) from `t1`;