Although it's convenient that you can declare a whole lot of variables in one line, the big advantage is that you can handle assignments at the same time:
my ($foo, $bar) = @array;
The only warning I can give is that using an undef in the list will throw warnings (errors?) in older versions of perl:
my (undef, $foo, undef, $bar) = @array;
You can assign values from a list of scalars, as well, but I think it's less legible than assigning one at a time:
my ($foo, $bar, $baz) = (27, 'blah', $x);
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