I noticed page breaking issue in my patch.
I've fixed it.
--- texinfo.tex.org	2016-01-21 23:04:22.405562200 +0900
+++ texinfo.tex	2016-01-28 22:23:50.283561700 +0900
@@ -9433,43 +9433,68 @@
   \global\righthyphenmin = #3\relax
 }
 
-% Get input by bytes instead of by UTF-8 codepoints for XeTeX and LuaTeX, 
-% otherwise the encoding support is completely broken.
+% XeTeX and LuaTeX can handle native Unicode.
+% Their default I/O is UTF-8 sequence instead of byte-wise.
+% Other TeX engine (pdfTeX etc.) I/O is byte-wise.
+%
+\newif\iftxinativeunicodecapable
+\newif\iftxiusebytewiseio
+
 \ifx\XeTeXrevision\thisisundefined
+  \ifx\luatexversion\thisisundefined
+    \txinativeunicodecapablefalse
+    \txiusebytewiseiotrue
+  \else
+    \txinativeunicodecapabletrue
+    \txiusebytewiseiofalse
+  \fi
 \else
-\XeTeXdefaultencoding "bytes"  % For subsequent files to be read
-\XeTeXinputencoding "bytes"  % Effective in texinfo.tex only
-% Unfortunately, there seems to be no corresponding XeTeX command for
-% output encoding.  This is a problem for auxiliary index and TOC files.
-% The only solution would be perhaps to write out @U{...} sequences in
-% place of UTF-8 characters.
+  \txinativeunicodecapabletrue
+  \txiusebytewiseiofalse
 \fi
 
-\ifx\luatexversion\thisisundefined
-\else
-\directlua{
-local utf8_char, byte, gsub = unicode.utf8.char, string.byte, string.gsub
-local function convert_char (char)
-  return utf8_char(byte(char))
-end
-
-local function convert_line (line)
-  return gsub(line, ".", convert_char)
-end
-
-callback.register("process_input_buffer", convert_line)
-
-local function convert_line_out (line)
-  local line_out = ""
-  for c in string.utfvalues(line) do
-     line_out = line_out .. string.char(c)
-  end
-  return line_out
-end
+% Set I/O by bytes instead of UTF-8 sequence for XeTeX and LuaTex
+% for non-UTF-8 (byte-wise) encodings.
+%
+\def\setbytewiseio{%
+  \ifx\XeTeXrevision\thisisundefined
+  \else
+    \XeTeXdefaultencoding "bytes"  % For subsequent files to be read
+    \XeTeXinputencoding "bytes"  % For document root file
+    % Unfortunately, there seems to be no corresponding XeTeX command for
+    % output encoding.  This is a problem for auxiliary index and TOC files.
+    % The only solution would be perhaps to write out @U{...} sequences in
+    % place of non-ASCII characters.
+  \fi
 
-callback.register("process_output_buffer", convert_line_out)
+  \ifx\luatexversion\thisisundefined
+  \else
+    \directlua{
+    local utf8_char, byte, gsub = unicode.utf8.char, string.byte, string.gsub
+    local function convert_char (char)
+      return utf8_char(byte(char))
+    end
+
+    local function convert_line (line)
+      return gsub(line, ".", convert_char)
+    end
+
+    callback.register("process_input_buffer", convert_line)
+
+    local function convert_line_out (line)
+      local line_out = ""
+      for c in string.utfvalues(line) do
+         line_out = line_out .. string.char(c)
+      end
+      return line_out
+    end
+
+    callback.register("process_output_buffer", convert_line_out)
+    }
+  \fi
+
+  \txiusebytewiseiotrue
 }
-\fi
 
 
 % Helpers for encodings.
@@ -9496,13 +9521,6 @@
 %
 \def\documentencoding{\parseargusing\filenamecatcodes\documentencodingzzz}
 \def\documentencodingzzz#1{%
-  % Get input by bytes instead of by UTF-8 codepoints for XeTeX,
-  % otherwise the encoding support is completely broken.
-  % This settings is for the document root file.
-  \ifx\XeTeXrevision\thisisundefined
-  \else
-    \XeTeXinputencoding "bytes"
-  \fi
   %
   % Encoding being declared for the document.
   \def\declaredencoding{\csname #1.enc\endcsname}%
@@ -9519,22 +9537,37 @@
      \asciichardefs
   %
   \else \ifx \declaredencoding \lattwo
+     \iftxinativeunicodecapable
+       \setbytewiseio
+     \fi
      \setnonasciicharscatcode\active
      \lattwochardefs
   %
   \else \ifx \declaredencoding \latone
+     \iftxinativeunicodecapable
+       \setbytewiseio
+     \fi
      \setnonasciicharscatcode\active
      \latonechardefs
   %
   \else \ifx \declaredencoding \latnine
+     \iftxinativeunicodecapable
+       \setbytewiseio
+     \fi
      \setnonasciicharscatcode\active
      \latninechardefs
   %
   \else \ifx \declaredencoding \utfeight
-     \setnonasciicharscatcode\active
-     % since we already invoked \utfeightchardefs at the top level
-     % (below), do not re-invoke it, then our check for duplicated
-     % definitions triggers.  Making non-ascii chars active is enough.
+     \iftxinativeunicodecapable
+       % For native Unicode (XeTeX and LuaTeX)
+       \nativeunicodechardefs
+     \else
+       % For UTF-8 byte sequence (pdfTeX)
+       \setnonasciicharscatcode\active
+       % since we already invoked \utfeightchardefs at the top level
+       % (below), do not re-invoke it, then our check for duplicated
+       % definitions triggers.  Making non-ascii chars active is enough.
+     \fi
   %
   \else
     \message{Ignoring unknown document encoding: #1.}%
@@ -9849,13 +9882,26 @@
 % @U{xxxx} to produce U+xxxx, if we support it.
 \def\U#1{%
   \expandafter\ifx\csname uni:#1\endcsname \relax
-    \errhelp = \EMsimple	
-    \errmessage{Unicode character U+#1 not supported, sorry}%
+    \iftxinativeunicodecapable
+      % Any Unicode characters can be used by native Unicode.
+      % However, if the font does not have the glyph, the letter will miss.
+      \begingroup
+        \uccode`\.="#1\relax
+        \uppercase{.}
+      \endgroup
+    \else
+      \errhelp = \EMsimple	
+      \errmessage{Unicode character U+#1 not supported, sorry}%
+    \fi
   \else
     \csname uni:#1\endcsname
   \fi
 }
 
+% For UTF-8 byte sequence (pdfTeX)
+% Definition macro to replace the Unicode character
+% Definition macro that is used by @U command
+%
 \begingroup
   \catcode`\"=12
   \catcode`\<=12
@@ -9864,7 +9910,7 @@
   \catcode`\;=12
   \catcode`\!=12
   \catcode`\~=13
-  \gdef\DeclareUnicodeCharacter#1#2{%
+  \gdef\DeclareUnicodeCharacterUTFviii#1#2{%
     \countUTFz = "#1\relax
     %\wlog{\space\space defining Unicode char U+#1 (decimal \the\countUTFz)}%
     \begingroup
@@ -9922,6 +9968,37 @@
     \uppercase{\gdef\UTFviiiTmp{#2#3#4}}}
 \endgroup
 
+% For native Unicode (XeTeX and LuaTeX)
+% Definition macro to replace the Unicode character
+%
+\def\DeclareUnicodeCharacterNative#1#2{%
+  \catcode"#1=\active
+  \begingroup
+    \uccode`\~="#1\relax
+    \uppercase{\gdef~}{#2}%
+  \endgroup}
+
+% For native Unicode (XeTeX and LuaTeX)
+% Definition macro not to replace (through) the Unicode character
+%
+\def\DeclareUnicodeCharacterNativeThru#1#2{%
+  \catcode"#1=\active
+  \begingroup
+    \uccode`\.="#1\relax
+    \uppercase{\endgroup \def\UTFNativeTmp{.}}%
+  \begingroup
+    \uccode`\~="#1\relax
+    \uppercase{\endgroup \edef~}{\UTFNativeTmp}%
+}
+
+% For native Unicode (XeTeX and LuaTeX)
+% Definition macro that is used by @U command
+%
+\def\DeclareUnicodeCharacterNativeAtU#1#2{%
+  \def\UTFAtUTmp{#2}
+  \expandafter\globallet\csname uni:#1\endcsname \UTFAtUTmp
+}
+
 % https://en.wikipedia.org/wiki/Plane_(Unicode)#Basic_M
 % U+0000..U+007F = https://en.wikipedia.org/wiki/Basic_Latin_(Unicode_block)
 % U+0080..U+00FF = https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)
@@ -9936,7 +10013,7 @@
 % We won't be doing that here in this simple file.  But we can try to at
 % least make most of the characters not bomb out.
 %
-\def\utfeightchardefs{%
+\def\unicodechardefs{%
   \DeclareUnicodeCharacter{00A0}{\tie}
   \DeclareUnicodeCharacter{00A1}{\exclamdown}
   \DeclareUnicodeCharacter{00A2}{{\tcfont \char162}}% 0242=cent
@@ -9953,7 +10030,7 @@
   \DeclareUnicodeCharacter{00AD}{\-}
   \DeclareUnicodeCharacter{00AE}{\registeredsymbol}
   \DeclareUnicodeCharacter{00AF}{\={ }}
-
+%
   \DeclareUnicodeCharacter{00B0}{\ringaccent{ }}
   \DeclareUnicodeCharacter{00B1}{\ensuremath\pm}
   \DeclareUnicodeCharacter{00B2}{$^2$}
@@ -9970,7 +10047,7 @@
   \DeclareUnicodeCharacter{00BD}{$1\over2$}
   \DeclareUnicodeCharacter{00BE}{$3\over4$}
   \DeclareUnicodeCharacter{00BF}{\questiondown}
-
+%
   \DeclareUnicodeCharacter{00C0}{\`A}
   \DeclareUnicodeCharacter{00C1}{\'A}
   \DeclareUnicodeCharacter{00C2}{\^A}
@@ -9987,7 +10064,7 @@
   \DeclareUnicodeCharacter{00CD}{\'I}
   \DeclareUnicodeCharacter{00CE}{\^I}
   \DeclareUnicodeCharacter{00CF}{\"I}
-
+%
   \DeclareUnicodeCharacter{00D0}{\DH}
   \DeclareUnicodeCharacter{00D1}{\~N}
   \DeclareUnicodeCharacter{00D2}{\`O}
@@ -10004,7 +10081,7 @@
   \DeclareUnicodeCharacter{00DD}{\'Y}
   \DeclareUnicodeCharacter{00DE}{\TH}
   \DeclareUnicodeCharacter{00DF}{\ss}
-
+%
   \DeclareUnicodeCharacter{00E0}{\`a}
   \DeclareUnicodeCharacter{00E1}{\'a}
   \DeclareUnicodeCharacter{00E2}{\^a}
@@ -10021,7 +10098,7 @@
   \DeclareUnicodeCharacter{00ED}{\'{\dotless{i}}}
   \DeclareUnicodeCharacter{00EE}{\^{\dotless{i}}}
   \DeclareUnicodeCharacter{00EF}{\"{\dotless{i}}}
-
+%
   \DeclareUnicodeCharacter{00F0}{\dh}
   \DeclareUnicodeCharacter{00F1}{\~n}
   \DeclareUnicodeCharacter{00F2}{\`o}
@@ -10038,7 +10115,7 @@
   \DeclareUnicodeCharacter{00FD}{\'y}
   \DeclareUnicodeCharacter{00FE}{\th}
   \DeclareUnicodeCharacter{00FF}{\"y}
-
+%
   \DeclareUnicodeCharacter{0100}{\=A}
   \DeclareUnicodeCharacter{0101}{\=a}
   \DeclareUnicodeCharacter{0102}{\u{A}}
@@ -10055,7 +10132,7 @@
   \DeclareUnicodeCharacter{010D}{\v{c}}
   \DeclareUnicodeCharacter{010E}{\v{D}}
   \DeclareUnicodeCharacter{010F}{d'}
-
+%
   \DeclareUnicodeCharacter{0110}{\DH}
   \DeclareUnicodeCharacter{0111}{\dh}
   \DeclareUnicodeCharacter{0112}{\=E}
@@ -10072,7 +10149,7 @@
   \DeclareUnicodeCharacter{011D}{\^g}
   \DeclareUnicodeCharacter{011E}{\u{G}}
   \DeclareUnicodeCharacter{011F}{\u{g}}
-
+%
   \DeclareUnicodeCharacter{0120}{\dotaccent{G}}
   \DeclareUnicodeCharacter{0121}{\dotaccent{g}}
   \DeclareUnicodeCharacter{0122}{\cedilla{G}}
@@ -10089,7 +10166,7 @@
   \DeclareUnicodeCharacter{012D}{\u{\dotless{i}}}
   \DeclareUnicodeCharacter{012E}{\ogonek{I}}
   \DeclareUnicodeCharacter{012F}{\ogonek{i}}
-
+%
   \DeclareUnicodeCharacter{0130}{\dotaccent{I}}
   \DeclareUnicodeCharacter{0131}{\dotless{i}}
   \DeclareUnicodeCharacter{0132}{IJ}
@@ -10106,7 +10183,7 @@
   \DeclareUnicodeCharacter{013D}{L'}% should kern
   \DeclareUnicodeCharacter{013E}{l'}% should kern
   \DeclareUnicodeCharacter{013F}{L\U{00B7}}
-
+%
   \DeclareUnicodeCharacter{0140}{l\U{00B7}}
   \DeclareUnicodeCharacter{0141}{\L}
   \DeclareUnicodeCharacter{0142}{\l}
@@ -10123,7 +10200,7 @@
   \DeclareUnicodeCharacter{014D}{\=o}
   \DeclareUnicodeCharacter{014E}{\u{O}}
   \DeclareUnicodeCharacter{014F}{\u{o}}
-
+%
   \DeclareUnicodeCharacter{0150}{\H{O}}
   \DeclareUnicodeCharacter{0151}{\H{o}}
   \DeclareUnicodeCharacter{0152}{\OE}
@@ -10140,7 +10217,7 @@
   \DeclareUnicodeCharacter{015D}{\^s}
   \DeclareUnicodeCharacter{015E}{\cedilla{S}}
   \DeclareUnicodeCharacter{015F}{\cedilla{s}}
-
+%
   \DeclareUnicodeCharacter{0160}{\v{S}}
   \DeclareUnicodeCharacter{0161}{\v{s}}
   \DeclareUnicodeCharacter{0162}{\cedilla{T}}
@@ -10157,7 +10234,7 @@
   \DeclareUnicodeCharacter{016D}{\u{u}}
   \DeclareUnicodeCharacter{016E}{\ringaccent{U}}
   \DeclareUnicodeCharacter{016F}{\ringaccent{u}}
-
+%
   \DeclareUnicodeCharacter{0170}{\H{U}}
   \DeclareUnicodeCharacter{0171}{\H{u}}
   \DeclareUnicodeCharacter{0172}{\ogonek{U}}
@@ -10174,7 +10251,7 @@
   \DeclareUnicodeCharacter{017D}{\v{Z}}
   \DeclareUnicodeCharacter{017E}{\v{z}}
   \DeclareUnicodeCharacter{017F}{\missingcharmsg{LONG S}}
-
+%
   \DeclareUnicodeCharacter{01C4}{D\v{Z}}
   \DeclareUnicodeCharacter{01C5}{D\v{z}}
   \DeclareUnicodeCharacter{01C6}{d\v{z}}
@@ -10187,20 +10264,20 @@
   \DeclareUnicodeCharacter{01CD}{\v{A}}
   \DeclareUnicodeCharacter{01CE}{\v{a}}
   \DeclareUnicodeCharacter{01CF}{\v{I}}
-
+%
   \DeclareUnicodeCharacter{01D0}{\v{\dotless{i}}}
   \DeclareUnicodeCharacter{01D1}{\v{O}}
   \DeclareUnicodeCharacter{01D2}{\v{o}}
   \DeclareUnicodeCharacter{01D3}{\v{U}}
   \DeclareUnicodeCharacter{01D4}{\v{u}}
-
+%
   \DeclareUnicodeCharacter{01E2}{\={\AE}}
   \DeclareUnicodeCharacter{01E3}{\={\ae}}
   \DeclareUnicodeCharacter{01E6}{\v{G}}
   \DeclareUnicodeCharacter{01E7}{\v{g}}
   \DeclareUnicodeCharacter{01E8}{\v{K}}
   \DeclareUnicodeCharacter{01E9}{\v{k}}
-
+%
   \DeclareUnicodeCharacter{01F0}{\v{\dotless{j}}}
   \DeclareUnicodeCharacter{01F1}{DZ}
   \DeclareUnicodeCharacter{01F2}{Dz}
@@ -10213,23 +10290,23 @@
   \DeclareUnicodeCharacter{01FD}{\'{\ae}}
   \DeclareUnicodeCharacter{01FE}{\'{\O}}
   \DeclareUnicodeCharacter{01FF}{\'{\o}}
-
+%
   \DeclareUnicodeCharacter{021E}{\v{H}}
   \DeclareUnicodeCharacter{021F}{\v{h}}
-
+%
   \DeclareUnicodeCharacter{0226}{\dotaccent{A}}
   \DeclareUnicodeCharacter{0227}{\dotaccent{a}}
   \DeclareUnicodeCharacter{0228}{\cedilla{E}}
   \DeclareUnicodeCharacter{0229}{\cedilla{e}}
   \DeclareUnicodeCharacter{022E}{\dotaccent{O}}
   \DeclareUnicodeCharacter{022F}{\dotaccent{o}}
-
+%
   \DeclareUnicodeCharacter{0232}{\=Y}
   \DeclareUnicodeCharacter{0233}{\=y}
   \DeclareUnicodeCharacter{0237}{\dotless{j}}
-
+%
   \DeclareUnicodeCharacter{02DB}{\ogonek{ }}
-
+%
   % Greek letters upper case
   \DeclareUnicodeCharacter{0391}{{\it A}}
   \DeclareUnicodeCharacter{0392}{{\it B}}
@@ -10256,7 +10333,7 @@
   \DeclareUnicodeCharacter{03A7}{{\it X}}
   \DeclareUnicodeCharacter{03A8}{\ensuremath{\mit\Psi}}
   \DeclareUnicodeCharacter{03A9}{\ensuremath{\mit\Omega}}
-
+%
   % Vowels with accents
   \DeclareUnicodeCharacter{0390}{\ensuremath{\ddot{\acute\iota}}}
   \DeclareUnicodeCharacter{03AC}{\ensuremath{\acute\alpha}}
@@ -10264,10 +10341,10 @@
   \DeclareUnicodeCharacter{03AE}{\ensuremath{\acute\eta}}
   \DeclareUnicodeCharacter{03AF}{\ensuremath{\acute\iota}}
   \DeclareUnicodeCharacter{03B0}{\ensuremath{\acute{\ddot\upsilon}}}
-
+%
   % Standalone accent
   \DeclareUnicodeCharacter{0384}{\ensuremath{\acute{\ }}}
-
+%
   % Greek letters lower case
   \DeclareUnicodeCharacter{03B1}{\ensuremath\alpha}
   \DeclareUnicodeCharacter{03B2}{\ensuremath\beta}
@@ -10294,19 +10371,19 @@
   \DeclareUnicodeCharacter{03C7}{\ensuremath\chi}
   \DeclareUnicodeCharacter{03C8}{\ensuremath\psi}
   \DeclareUnicodeCharacter{03C9}{\ensuremath\omega}
-
+%
   % More Greek vowels with accents
   \DeclareUnicodeCharacter{03CA}{\ensuremath{\ddot\iota}}
   \DeclareUnicodeCharacter{03CB}{\ensuremath{\ddot\upsilon}}
   \DeclareUnicodeCharacter{03CC}{\ensuremath{\acute o}}
   \DeclareUnicodeCharacter{03CD}{\ensuremath{\acute\upsilon}}
   \DeclareUnicodeCharacter{03CE}{\ensuremath{\acute\omega}}
-
+%
   % Variant Greek letters
   \DeclareUnicodeCharacter{03D1}{\ensuremath\vartheta}
   \DeclareUnicodeCharacter{03D6}{\ensuremath\varpi}
   \DeclareUnicodeCharacter{03F1}{\ensuremath\varrho}
-
+%
   \DeclareUnicodeCharacter{1E02}{\dotaccent{B}}
   \DeclareUnicodeCharacter{1E03}{\dotaccent{b}}
   \DeclareUnicodeCharacter{1E04}{\udotaccent{B}}
@@ -10319,10 +10396,10 @@
   \DeclareUnicodeCharacter{1E0D}{\udotaccent{d}}
   \DeclareUnicodeCharacter{1E0E}{\ubaraccent{D}}
   \DeclareUnicodeCharacter{1E0F}{\ubaraccent{d}}
-
+%
   \DeclareUnicodeCharacter{1E1E}{\dotaccent{F}}
   \DeclareUnicodeCharacter{1E1F}{\dotaccent{f}}
-
+%
   \DeclareUnicodeCharacter{1E20}{\=G}
   \DeclareUnicodeCharacter{1E21}{\=g}
   \DeclareUnicodeCharacter{1E22}{\dotaccent{H}}
@@ -10331,7 +10408,7 @@
   \DeclareUnicodeCharacter{1E25}{\udotaccent{h}}
   \DeclareUnicodeCharacter{1E26}{\"H}
   \DeclareUnicodeCharacter{1E27}{\"h}
-
+%
   \DeclareUnicodeCharacter{1E30}{\'K}
   \DeclareUnicodeCharacter{1E31}{\'k}
   \DeclareUnicodeCharacter{1E32}{\udotaccent{K}}
@@ -10344,7 +10421,7 @@
   \DeclareUnicodeCharacter{1E3B}{\ubaraccent{l}}
   \DeclareUnicodeCharacter{1E3E}{\'M}
   \DeclareUnicodeCharacter{1E3F}{\'m}
-
+%
   \DeclareUnicodeCharacter{1E40}{\dotaccent{M}}
   \DeclareUnicodeCharacter{1E41}{\dotaccent{m}}
   \DeclareUnicodeCharacter{1E42}{\udotaccent{M}}
@@ -10355,7 +10432,7 @@
   \DeclareUnicodeCharacter{1E47}{\udotaccent{n}}
   \DeclareUnicodeCharacter{1E48}{\ubaraccent{N}}
   \DeclareUnicodeCharacter{1E49}{\ubaraccent{n}}
-
+%
   \DeclareUnicodeCharacter{1E54}{\'P}
   \DeclareUnicodeCharacter{1E55}{\'p}
   \DeclareUnicodeCharacter{1E56}{\dotaccent{P}}
@@ -10366,7 +10443,7 @@
   \DeclareUnicodeCharacter{1E5B}{\udotaccent{r}}
   \DeclareUnicodeCharacter{1E5E}{\ubaraccent{R}}
   \DeclareUnicodeCharacter{1E5F}{\ubaraccent{r}}
-
+%
   \DeclareUnicodeCharacter{1E60}{\dotaccent{S}}
   \DeclareUnicodeCharacter{1E61}{\dotaccent{s}}
   \DeclareUnicodeCharacter{1E62}{\udotaccent{S}}
@@ -10377,12 +10454,12 @@
   \DeclareUnicodeCharacter{1E6D}{\udotaccent{t}}
   \DeclareUnicodeCharacter{1E6E}{\ubaraccent{T}}
   \DeclareUnicodeCharacter{1E6F}{\ubaraccent{t}}
-
+%
   \DeclareUnicodeCharacter{1E7C}{\~V}
   \DeclareUnicodeCharacter{1E7D}{\~v}
   \DeclareUnicodeCharacter{1E7E}{\udotaccent{V}}
   \DeclareUnicodeCharacter{1E7F}{\udotaccent{v}}
-
+%
   \DeclareUnicodeCharacter{1E80}{\`W}
   \DeclareUnicodeCharacter{1E81}{\`w}
   \DeclareUnicodeCharacter{1E82}{\'W}
@@ -10399,7 +10476,7 @@
   \DeclareUnicodeCharacter{1E8D}{\"x}
   \DeclareUnicodeCharacter{1E8E}{\dotaccent{Y}}
   \DeclareUnicodeCharacter{1E8F}{\dotaccent{y}}
-
+%
   \DeclareUnicodeCharacter{1E90}{\^Z}
   \DeclareUnicodeCharacter{1E91}{\^z}
   \DeclareUnicodeCharacter{1E92}{\udotaccent{Z}}
@@ -10410,30 +10487,30 @@
   \DeclareUnicodeCharacter{1E97}{\"t}
   \DeclareUnicodeCharacter{1E98}{\ringaccent{w}}
   \DeclareUnicodeCharacter{1E99}{\ringaccent{y}}
-
+%
   \DeclareUnicodeCharacter{1EA0}{\udotaccent{A}}
   \DeclareUnicodeCharacter{1EA1}{\udotaccent{a}}
-
+%
   \DeclareUnicodeCharacter{1EB8}{\udotaccent{E}}
   \DeclareUnicodeCharacter{1EB9}{\udotaccent{e}}
   \DeclareUnicodeCharacter{1EBC}{\~E}
   \DeclareUnicodeCharacter{1EBD}{\~e}
-
+%
   \DeclareUnicodeCharacter{1ECA}{\udotaccent{I}}
   \DeclareUnicodeCharacter{1ECB}{\udotaccent{i}}
   \DeclareUnicodeCharacter{1ECC}{\udotaccent{O}}
   \DeclareUnicodeCharacter{1ECD}{\udotaccent{o}}
-
+%
   \DeclareUnicodeCharacter{1EE4}{\udotaccent{U}}
   \DeclareUnicodeCharacter{1EE5}{\udotaccent{u}}
-
+%
   \DeclareUnicodeCharacter{1EF2}{\`Y}
   \DeclareUnicodeCharacter{1EF3}{\`y}
   \DeclareUnicodeCharacter{1EF4}{\udotaccent{Y}}
-
+%
   \DeclareUnicodeCharacter{1EF8}{\~Y}
   \DeclareUnicodeCharacter{1EF9}{\~y}
-
+%
   % Punctuation
   \DeclareUnicodeCharacter{2013}{--}
   \DeclareUnicodeCharacter{2014}{---}
@@ -10450,12 +10527,12 @@
   \DeclareUnicodeCharacter{2026}{\dots}
   \DeclareUnicodeCharacter{2039}{\guilsinglleft}
   \DeclareUnicodeCharacter{203A}{\guilsinglright}
-
+%
   \DeclareUnicodeCharacter{20AC}{\euro}
-
+%
   \DeclareUnicodeCharacter{2192}{\expansion}
   \DeclareUnicodeCharacter{21D2}{\result}
-
+%
   % Mathematical symbols
   \DeclareUnicodeCharacter{2200}{\ensuremath\forall}
   \DeclareUnicodeCharacter{2203}{\ensuremath\exists}
@@ -10471,7 +10548,7 @@
   \DeclareUnicodeCharacter{2265}{\ensuremath\geq}
   \DeclareUnicodeCharacter{2282}{\ensuremath\subset}
   \DeclareUnicodeCharacter{2287}{\ensuremath\supseteq}
-
+%
   \DeclareUnicodeCharacter{2016}{\ensuremath\Vert}
   \DeclareUnicodeCharacter{2032}{\ensuremath\prime}
   \DeclareUnicodeCharacter{210F}{\ensuremath\hbar}
@@ -10571,7 +10648,7 @@
   \DeclareUnicodeCharacter{230B}{\ensuremath\rfloor}
   \DeclareUnicodeCharacter{2322}{\ensuremath\frown}
   \DeclareUnicodeCharacter{2323}{\ensuremath\smile}
-
+%
   \DeclareUnicodeCharacter{25A1}{\ensuremath\Box}
   \DeclareUnicodeCharacter{25B3}{\ensuremath\triangle}
   \DeclareUnicodeCharacter{25B7}{\ensuremath\triangleright}
@@ -10603,17 +10680,45 @@
   \DeclareUnicodeCharacter{2A3F}{\ensuremath\amalg}
   \DeclareUnicodeCharacter{2AAF}{\ensuremath\preceq}
   \DeclareUnicodeCharacter{2AB0}{\ensuremath\succeq}
-
+%
   \global\mathchardef\checkmark="1370 % actually the square root sign
   \DeclareUnicodeCharacter{2713}{\ensuremath\checkmark}
-}% end of \utfeightchardefs
+}% end of \unicodechardefs
+
+% UTF-8 byte sequence (pdfTeX) definitions (replacing and @U command)
+% It makes the setting that replace UTF-8 byte sequence.
+\def\utfeightchardefs{%
+  \let\DeclareUnicodeCharacter\DeclareUnicodeCharacterUTFviii
+  \unicodechardefs
+}
+
+% Native Unicode (XeTeX and LuaTeX) character replacing definitions
+% It makes the setting that replace the Unicode characters.
+\def\nativeunicodechardefs{%
+  \let\DeclareUnicodeCharacter\DeclareUnicodeCharacterNative
+  \unicodechardefs
+}
+
+% Native Unicode (XeTeX and LuaTeX) character ``through'' definitions
+% It makes the setting that does not replace the Unicode characters.
+\def\nativeunicodechardefsthru{%
+  \let\DeclareUnicodeCharacter\DeclareUnicodeCharacterNativeThru
+  \unicodechardefs
+}
+
+% Native Unicode (XeTeX and LuaTeX) @U command definitions
+\def\nativeunicodechardefsatu{%
+  \let\DeclareUnicodeCharacter\DeclareUnicodeCharacterNativeAtU
+  \unicodechardefs
+}
 
 % US-ASCII character definitions.
 \def\asciichardefs{% nothing need be done
    \relax
 }
 
-% Latin1 (ISO-8859-1) character definitions.
+% Non-ASCII bytes ``through'' definitions.
+% It makes the setting that does not replace the non-ASCII byte.
 \def\nonasciistringdefs{%
   \setnonasciicharscatcode\active
   \def\defstringchar##1{\def##1{\string##1}}%
@@ -10659,9 +10764,23 @@
   \defstringchar^^fc\defstringchar^^fd\defstringchar^^fe\defstringchar^^ff%
 }
 
+% Character ``through'' definitions.
+% It makes the setting that does not replace the characters.
+\def\throughcharactersdefs{%
+  \iftxiusebytewiseio
+    \nonasciistringdefs
+  \else
+    \nativeunicodechardefsthru
+  \fi
+}
+
 
 % define all the unicode characters we know about, for the sake of @U.
-\utfeightchardefs
+\iftxinativeunicodecapable
+  \nativeunicodechardefsatu
+\else
+  \utfeightchardefs
+\fi
 
 
 % Make non-ASCII characters printable again for compatibility with
@@ -11010,7 +11129,7 @@
 %
 {@catcode`- = @active
  @gdef@normalturnoffactive{%
-   @nonasciistringdefs
+   @throughcharactersdefs
    @let-=@normaldash
    @let"=@normaldoublequote
    @let$=@normaldollar %$ font-lock fix

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