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  1. or download this
    if (exists($h{x} && defined($h{x}) && $h{x})
  2. or download this
    if ($h{x})
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    if (defined($s) && length($s))
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    if (length($s))
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    my $length = length($undef);  # Used to warn here.
print $length;                # Still warn here.
...
pack 'N', $length             # Still warn here.

...