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    The third parameter, the input parameter list, specifies how many
arguments the function wants, and their types. It MUST be passed
...

    [a, b, c, d]
    \@LIST
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    my $arr = [ pack("d",1), pack("d",1.5), pack("d",3) ];

# or as I would do it...

my $arr = [ map { pack 'd', $_ } ( 1, 1.5, 3 ) ];
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    my @arr = map { pack 'd', $_ } ( 1, 1.5, 3 );