perl -C63 -MDevel::Peek -Mutf8 -le '$_="(\x{5fcd} Guimarães)"; Dump($_); print length($_); print'
SV = PV(0x8154b00) at 0x8153bd4
  REFCNT = 1
  FLAGS = (POK,pPOK,UTF8)
  PV = 0x8170460 "(\345\277\215 Guimar\303\243es)"\0 [UTF8 "(\x{5fcd} Guimar\x{e3}es)"]
  CUR = 16
  LEN = 20
13

##</code><code>##

perl -C63 -MDevel::Peek -Mutf8 -MUnicode::Normalize -le '$_="(\x{5fcd} Guimarães)"; $_ = NFD $_; Dump($_); print length($_); print'
SV = PV(0x8154b00) at 0x8153bd4
  REFCNT = 1
  FLAGS = (POK,pPOK,UTF8)
  PV = 0x816feb8 "(\345\277\215 Guimara\314\203es)"\0 [UTF8 "(\x{5fcd} Guimara\x{303}es)"]
  CUR = 17
  LEN = 20
14

##</code><code>##

perl -C63 -MDevel::Peek -Mutf8 -mText::CharWidth=mbswidth -le '$_="(\x{5fcd} Guimarães)"; Dump($_); print mbswidth($_); print'
SV = PV(0x8154b00) at 0x8153bd4
  REFCNT = 1
  FLAGS = (POK,pPOK,UTF8)
  PV = 0x8170460 "(\345\277\215 Guimar\303\243es)"\0 [UTF8 "(\x{5fcd} Guimar\x{e3}es)"]
  CUR = 16
  LEN = 20
14

##</code><code>##

perl -C63 -MDevel::Peek -Mutf8 -mEncode=encode_utf8 -le '$_="(\x{5fcd} Guimarães)"; Dump($_); print length(encode_utf8 $_)'
SV = PV(0x8154b00) at 0x8153bd4
  REFCNT = 1
  FLAGS = (POK,pPOK,UTF8)
  PV = 0x8170460 "(\345\277\215 Guimar\303\243es)"\0 [UTF8 "(\x{5fcd} Guimar\x{e3}es)"]
  CUR = 16
  LEN = 20
16