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$ perl -e 'print "\x{00b9}"' | hd
00000000  b9                                                |.|
          ^^-- notice the literal byte 0xB9
$ perl -CO -e 'print "\x{00b9}"' | hd
00000000  c2 b9                                             |..|
          ^^^^^-- this is the UTF-8 byte sequence for U+00B9