$ perl -MDP -we'my@x=("",undef,"1","123","2","\xff","\x{00ff}");DPeek
+for map{$_->[1]}sort{$a->[0]cmp$b->[0]}map{[$_//"\x{1ffff}",$_]}@x'
PV(""\0)
PV("1"\0)
PV("123"\0)
PV("2"\0)
PV("\377"\0)
PV("\377"\0)
UNDEF
And chr(255) is *not* per definition an y with two dots. That is only the case in (encodings supported by perl (cp1252, cp1254, cp1258, hp-roman8, iso-8859-1, iso-8859-9, iso-8859-14, iso-8859-15, iso-8859-16, and UTF-7. If you don't specify the encoding or (lord forbids) *assume* any of the just listed, chr(255):
7bit-jis \xFF
cp1006 ﹽ ARABIC SHADDA MEDIAL FORM
cp1026 APPLICATION PROGRAM COMMAND
cp1047 APPLICATION PROGRAM COMMAND
cp1250 ˙ DOT ABOVE
cp1251 я CYRILLIC SMALL LETTER YA
cp1252 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
cp1254 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
cp1256 ے ARABIC LETTER YEH BARREE
cp1257 ˙ DOT ABOVE
cp1258 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
cp37 APPLICATION PROGRAM COMMAND
cp424 APPLICATION PROGRAM COMMAND
cp437 NO-BREAK SPACE
cp500 APPLICATION PROGRAM COMMAND
cp737 NO-BREAK SPACE
cp775 NO-BREAK SPACE
cp850 NO-BREAK SPACE
cp852 NO-BREAK SPACE
cp855 NO-BREAK SPACE
cp856 NO-BREAK SPACE
cp857 NO-BREAK SPACE
cp858 NO-BREAK SPACE
cp860 NO-BREAK SPACE
cp861 NO-BREAK SPACE
cp862 NO-BREAK SPACE
cp863 NO-BREAK SPACE
cp865 NO-BREAK SPACE
cp866 NO-BREAK SPACE
cp869 NO-BREAK SPACE
cp875 APPLICATION PROGRAM COMMAND
cp932
cp936
cp949
cp950
gsm0338 ? QUESTION MARK
hp-roman8 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
iso-2022-jp \xFF
iso-2022-jp-1 \xFF
iso-2022-kr \xFF
iso-8859-1 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
iso-8859-10 ĸ LATIN SMALL LETTER KRA
iso-8859-13 ’ RIGHT SINGLE QUOTATION MARK
iso-8859-14 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
iso-8859-15 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
iso-8859-16 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
iso-8859-2 ˙ DOT ABOVE
iso-8859-3 ˙ DOT ABOVE
iso-8859-4 ˙ DOT ABOVE
iso-8859-5 џ CYRILLIC SMALL LETTER DZHE
iso-8859-9 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
koi8-f Ъ CYRILLIC CAPITAL LETTER HARD SIGN
koi8-r Ъ CYRILLIC CAPITAL LETTER HARD SIGN
koi8-u Ъ CYRILLIC CAPITAL LETTER HARD SIGN
MacArabic ے ARABIC LETTER YEH BARREE
MacCentralEurRoman ˇ CARON
MacChineseSimp … HORIZONTAL ELLIPSIS
MacChineseTrad … HORIZONTAL ELLIPSIS
MacCroatian ˇ CARON
MacCyrillic € EURO SIGN
MacFarsi ے ARABIC LETTER YEH BARREE
MacGreek SOFT HYPHEN
MacHebrew | VERTICAL LINE
MacIcelandic ˇ CARON
MacJapanese …
MacKorean …
MacRoman ˇ CARON
MacRomanian ˇ CARON
MacRumanian ˇ CARON
MacSami ǩ LATIN SMALL LETTER K WITH CARON
MacTurkish ˇ CARON
posix-bc ~ TILDE
UTF-7 ˙ LATIN SMALL LETTER Y WITH DIAERESIS
viscii Ữ LATIN CAPITAL LETTER U WITH HORN AND TILDE
Enjoy, Have FUN! H.Merijn
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