The arrays get flattened into one long list. @_ pours it into the first place looking for a list i.e. @Values.

You can pass the arrays as array references e.g. \@array.

In the subroutine you then need to dereference them, say,

my $array_ref = shift;
my @array = @{$array_ref};
[download]

The perlreftut is a good place to delve deeper into refs.