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   %perl -le'print 127.0.0.1' | cat -v
   ^?^@^@^A

  % perl -le'print 64.0.0.1' | cat -v
  @^@^@^A
...
  0
  % perl -le'print -65.0.0.1' | cat -v
  -A^@^@^A

  % perl -le'print -"aaa"' | cat -v
  -aaa

  % perl -MO=Deparse -e'print 65.0.0.1'
  print 65.0.0.1;
...
  print "-A\000\000\cA";
  % perl -MO=Deparse -e'print -64.0.0.1'
  print 0;