plperl returning setof foo[]

I have just noticed, somewhat to my chagrin, that while in a plperl
function that returns an array type you can return a perl arrayref, like
this:

return [qw(a b c)];

if the function returns a setof an array type you cannot do this:

return_next [qw(a b c)];

Now the plperl docs say:

Perl can return PostgreSQL arrays as references to Perl arrays. Here
is an example:

CREATE OR REPLACE function returns_array()
RETURNS text[][] AS $$
return [['a"b','c,d'],['e\\f','g']];
$$ LANGUAGE plperl;

select returns_array();

and while it doesn't specifically mention SRFs it doesn't exclude them,
either.

The fix is fairly small (see attached) although I need to check with
some perlguts guru to see if I need to decrement a refcounter here or there.

Nobody has complained about it over the years, so I wonder if it should
be backpatched. It wouldn't change any working behaviour, just remove
the non-working property of some documented behaviour.

cheers

andrew