plperl functions -- can they call each other?

create or replace function to_partial_ymd(int2,int2,int2)returns int4 as '
my ($y,$m,$d) = @_;
$m = 0 unless $y;
$m = 0 unless 1 <= $m and $m <= 12;
$d = 0 unless $m;
$d = 0 unless (1 <= $d and
    (
        # 28 days valid for ANY month:
        ($d <= 28)
        or
        # 29 days valid if not february -- or in a leap year
        ($d <= 29 and ( $m != 2 or $y % 4 == 0 ))
        or
        # 30 days valid if not february
        ($d <= 30 and $m != 2)
        or
        # 31 days valid jan/mar/may/jul/aug/oct/dec
        ($d <= 31 and $m =~ /^(1|3|5|7|8|10|12)$/)
    )
);
return ($y << 16) + ($m << 8) + ($d << 0);
' language 'plperl'; -- '

sure would be nice to have such hefty day-of-month logic just
ONCE, and be able to call it from other functions...

is there still no way for one plperl function to call another plperl
function? (i'm hoping that section 25.3.4 is out-of-date...)

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