You're being burnt by a combination of operator precedence and context.
my @index = @{$args{Index}} || ();
is interpreted as
my @index = (@{$args{Index}} || ());
Then the || operator forces scalar context on @{$args{Index}} which therefore gives the number of elements in the array (which is 2).
On the other hand,
my @index = @{$args{Index}} or ();
is interpreted as
(my @index = @{$args{Index}}) or ();
So the array is evaluated in list context and everything works as expected.
--
< http://www.dave.org.uk>
"The first rule of Perl club is you do not talk about
Perl club." -- Chip Salzenberg
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