I have some basic perl syntax questions from this beginner. I'm declaring an anonymous array in line 1, but I don't understand what the "0+" is doing in line 2? Also, in line 3, how is the assignment occurring for both $a and $b? As a scalar or an array element?

my $new = [$a, $b]
$myhash1{0+ $new} = $new;
$myhash2{$_} = $new for $a, $b;
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