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$ perl -MDevel::Peek -e "Dump $f=chr(400) "
SV = PV(0x3e69ec) at 0x98a414
...
  PV = 0x98419c "\306\220"\0 [UTF8 "\x{190}"]
  CUR = 2
  LEN = 4

$ perl -MDevel::Peek -e " use bytes; Dump $f=chr(400) "
SV = PV(0x3e69f4) at 0x98a434
...
  CUR = 1
  LEN = 4

$ perl -MDevel::Peek -e " use bytes;  $f=chr(400); utf8::upgrade($f); 
+Dump $f "
SV = PV(0x3e6a0c) at 0x98a474
...
  PV = 0x3ef4e4 "\302\220"\0 [UTF8 "\x{90}"]
  CUR = 2
  LEN = 3