$ ./test-in.pl
SV = PV(0x77dc60) at 0x953728
  REFCNT = 1
  FLAGS = (TEMP,POK,pPOK,UTF8)
  PV = 0x829130 "\357\273\277\341\210\264\r\n\345\231\270\r\n"\0 [UTF8 "\x{feff}\x{1234}\r\n\x{5678}\r\n"]
  CUR = 13                                ^               ^
  LEN = 14