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  1. or download this
    $t = unpack('C', $foo);
    if ($t == 0) { $v = unpack('C', substr($foo, 1)) }
    elsif ($t == 1) { $v = unpack('S', substr($foo, 1)) }
    elsif ($t == 2) { $v = unpack('L', substr($foo, 1)) }
    elsif ($t == 3) { $v = unpack('Z*', substr($foo, 1)) }
    
  2. or download this
    $"=$,,$_=q>|\p4<6 8p<M/_|<('=>
    .q>.<4-KI<l|2$<6%s!<qn#F<>;$,
    .=pack'N*',"@{[unpack'C*',$_]
    }"for split/</;$_=$,,y[A-Z a-z]
             {}cd;print lc