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  1. or download this
    pack('q>', $_);  # Signed
pack('Q>', $_);  # Unsigned
  2. or download this
    pack('NN', $_<0 ? -1 : 0, $_);  # Signed
pack('NN', 0, $_);              # Unsigned
  3. or download this
    sprintf('%8X', $_);   # Padded with spaces
sprintf('%08X', $_);  # Padded with zeros