cleanup_register(..) works but not push_handlers(PerlCleanupHandler ..)

Hi,

Using modperl 2.0.4 and HTML::Mason I noticed the following problem:

	$r->push_handlers(PerlCleanupHandler => sub {...})

is not executed, however:
	
	$r->pool->cleanup_register({}, $arg)

works fine.

In both cases I use:

	$r->connection()->keepalive(Apache2::Const::CONN_CLOSE);

to avoid any keepalive side effect.

Any idea?