diff --git a/test.tex b/test.tex
index 16a3f4f950a3c30eca56c01b8af1e25ad8d39294..34056c135a807945170b82dd2212c67121333f78 100644
--- a/test.tex
+++ b/test.tex
@@ -1,3 +1,5 @@
+% demo file, not complex enough for copyright
+
 \documentclass{article}%
 
 \usepackage[utf8]{inputenc}%
diff --git a/unicodedomino.sty b/unicodedomino.sty
index 777c8adc7d5d2c0ecece0a5ae2b53de16e22480d..4c15f3d1e6ce49dde8ee00df4e69fdc17358db8f 100644
--- a/unicodedomino.sty
+++ b/unicodedomino.sty
@@ -2,9 +2,9 @@
 %-
 % Copyright © 2018
 %	mirabilos <m@mirbsd.org>
-% Copyright © 2017
+% Copyright © 2017, 2018
 %	mirabilos <t.glaser@tarent.de>
-% with contributions by (among others)
+% with contributions via chat by (among others)
 %	David Carlisle <http://tex.stackexchange.com/users/1090>
 %
 % Provided that these terms and disclaimer and all copyright notices
@@ -28,7 +28,7 @@
 % makes all UTF-8 available in listings.
 
 \NeedsTeXFormat{LaTeX2e}%
-\ProvidesPackage{unicodedomino}[2019/05/14 1.8 Domino for unknown codepoints]%
+\ProvidesPackage{unicodedomino}[2019/05/14 1.10 Domino for unknown codepoints]%
 
 \ifx\numexpr\@undefined%
  \PackageError{unicodedomino}{This package requires numexpr}%
@@ -37,6 +37,9 @@
  \PackageError{unicodedomino}{This package requires UTF-8 input encoding}%
 \fi%
 
+% pull compatibility code for users of older base/utf8ienc.dtx
+\input{unicodedomino_compat.def}%
+
 % pull code from other files
 \ifx\UTFviii@check@three\@undefined%
  \input{unicodedomino_kernel_fixup_f4_and_checkseq.def}%
@@ -45,7 +48,6 @@
  \input{unicodedomino_kernel_better_decode.def}%
 \fi%
 \input{unicodedomino_kernel_cosmetics.def}%
-\input{unicodedomino_compat.def}%
 
 % retrieve the last octet
 \def\unicodedomino@last#1{%
@@ -93,6 +95,22 @@
  \expandafter\UTFviii@defined\csname u8:#1\endcsname%
 }%
 
+% split an invalid byte sequence for error output
+\gdef\unicodedomino@splitseq#1:#2\relax{%
+ \unicodedomino@hexseq#2\relax%
+}%
+\gdef\unicodedomino@hexseq#1#2\relax{%
+ % display first octet
+ \space "\unicodedomino@hexbyte{`#1}%
+ % recursively handle remaining octets
+ \ifx\relax#2\relax\else\unicodedomino@hexseq#2\relax\fi%
+}%
+% format a number as two-digit hex
+\gdef\unicodedomino@hexbyte#1{%
+ \ifnum#1<16 0\fi%
+ \UTFviii@hexnumber{#1}%
+}%
+
 % main handler
 \def\UTFviii@defined#1{%
  \ifx#1\relax%
@@ -109,7 +127,7 @@
   \else%
    % invalid multibyte character
    \PackageError{inputenc}{Invalid UTF-8 byte sequence:%
-    \expandafter\UTFviii@splitseq\string#1\relax}%
+    \expandafter\unicodedomino@splitseq\string#1\relax}%
     \UTFviii@invalid@help
   \fi%
  \else%
diff --git a/unicodedomino_compat.def b/unicodedomino_compat.def
index 12e62ef939891c5f164098fd38f860d7c8c27909..bedde489ce3c6f57027a6c4af82541677e6ad6e6 100644
--- a/unicodedomino_compat.def
+++ b/unicodedomino_compat.def
@@ -1,22 +1,7 @@
 % -*- mode: tex -*-
 %-
-% Copyright © 2018
-%	mirabilos <m@mirbsd.org>
-%
-% Provided that these terms and disclaimer and all copyright notices
-% are retained or reproduced in an accompanying document, permission
-% is granted to deal in this work without restriction, including un‐
-% limited rights to use, publicly perform, distribute, sell, modify,
-% merge, give away, or sublicence.
-%
-% This work is provided “AS IS” and WITHOUT WARRANTY of any kind, to
-% the utmost extent permitted by applicable law, neither express nor
-% implied; without malicious intent or gross negligence. In no event
-% may a licensor, author or contributor be held liable for indirect,
-% direct, other damage, loss, or other issues arising in any way out
-% of dealing in the work, even if advised of the possibility of such
-% damage or existence of a defect, except proven that it results out
-% of said person’s immediate fault when using the work as intended.
+% See unicodedomino.sty for copyright and licence terms. Furthermore
+% this file is dual-licenced under the LPPL version 1.3c or later.
 %-
 % Compatibility code with older utf8.def versions
 
@@ -48,3 +33,12 @@
   Do ensure the source document is saved in UTF-8 encoding%
  }%
 \fi%
+
+% added in v1.2e 2018/09/30(?)
+\ifx\UTFviii@hexcodepoint\@undefined%
+ % override message to format the codepoint correctly
+ \gdef\UTFviii@splitcsname#1:#2\relax{%
+  #2 (\expandafter\UTFviii@hexcodepoint\expandafter{%
+   \the\numexpr\decode@UTFviii#2\relax})%
+ }%
+\fi%
diff --git a/unicodedomino_kernel_better_decode.def b/unicodedomino_kernel_better_decode.def
index aa0a72323275cf614d97700591fe9e03aadc8bae..9412650d200cdf6463d9296821bd5dff6e1e8581 100644
--- a/unicodedomino_kernel_better_decode.def
+++ b/unicodedomino_kernel_better_decode.def
@@ -1,32 +1,17 @@
 % -*- mode: tex -*-
 %-
-% Copyright © 2018
-%	mirabilos <t.glaser@tarent.de>
-%
-% Provided that these terms and disclaimer and all copyright notices
-% are retained or reproduced in an accompanying document, permission
-% is granted to deal in this work without restriction, including un‐
-% limited rights to use, publicly perform, distribute, sell, modify,
-% merge, give away, or sublicence.
-%
-% This work is provided “AS IS” and WITHOUT WARRANTY of any kind, to
-% the utmost extent permitted by applicable law, neither express nor
-% implied; without malicious intent or gross negligence. In no event
-% may a licensor, author or contributor be held liable for indirect,
-% direct, other damage, loss, or other issues arising in any way out
-% of dealing in the work, even if advised of the possibility of such
-% damage or existence of a defect, except proven that it results out
-% of said person’s immediate fault when using the work as intended.
-%
-% This file is dual-licenced under the LPPL version 1.3c or later.
+% See unicodedomino.sty for copyright and licence terms. Furthermore
+% this file is dual-licenced under the LPPL version 1.3c or later.
 %-
 % Improved Unicode decoding using the fixed-up checkseq code.
 
+%: https://github.com/latex3/latex2e/pull/83
 % override stock function, calling safer decode below
 \gdef\decode@UTFviii#1\relax{%
  \the\numexpr(\UTFviii@decode0:#1\relax)%
 }%
 
+%: https://github.com/latex3/latex2e/pull/83
 % safer decode, returns 0x1FFFFF for illegal sequences
 \gdef\UTFviii@decode#1\relax{%
  \if\relax\expandafter\UTFviii@checkseq\string#1\empty\relax%
@@ -36,6 +21,7 @@
  \fi%
 }%
 
+%: https://github.com/latex3/latex2e/pull/83
 \gdef\UTFviii@dec@lead#1:#2#3\relax{%
  % we know #2 is in 00..7F, C2..F4
  \ifnum`#2<"80 %
@@ -54,6 +40,7 @@
  \fi%
 }%
 
+%: https://github.com/latex3/latex2e/pull/83
 \gdef\UTFviii@dec@trail#1#2\relax{%
  )*64+(`#1-"80)%
  \ifx\relax#2\else\UTFviii@dec@trail#2\relax\fi%
diff --git a/unicodedomino_kernel_cosmetics.def b/unicodedomino_kernel_cosmetics.def
index 23de9eee4e0dd8684de007cf9d3757c212ee7bc5..ee2a96f1b5a6e4e2050f9261951a52b680ec1089 100644
--- a/unicodedomino_kernel_cosmetics.def
+++ b/unicodedomino_kernel_cosmetics.def
@@ -1,73 +1,27 @@
 % -*- mode: tex -*-
 %-
-% Copyright © 2017, 2018
-%	mirabilos <m@mirbsd.org>
-%
-% Provided that these terms and disclaimer and all copyright notices
-% are retained or reproduced in an accompanying document, permission
-% is granted to deal in this work without restriction, including un‐
-% limited rights to use, publicly perform, distribute, sell, modify,
-% merge, give away, or sublicence.
-%
-% This work is provided “AS IS” and WITHOUT WARRANTY of any kind, to
-% the utmost extent permitted by applicable law, neither express nor
-% implied; without malicious intent or gross negligence. In no event
-% may a licensor, author or contributor be held liable for indirect,
-% direct, other damage, loss, or other issues arising in any way out
-% of dealing in the work, even if advised of the possibility of such
-% damage or existence of a defect, except proven that it results out
-% of said person’s immediate fault when using the work as intended.
-%
-% This file is dual-licenced under the LPPL version 1.3c or later.
+% See unicodedomino.sty for copyright and licence terms. Furthermore
+% this file is dual-licenced under the LPPL version 1.3c or later.
 %-
-% Improve error and warning formatting. Fully submitted upstream.
-
-%: https://github.com/latex3/latex2e/pull/62
-\ifx\UTFviii@hexbyte\@undefined%
- % format a number as two-digit hex
- \gdef\UTFviii@hexbyte#1{%
-  \ifnum#1<16 0\fi%
-  \UTFviii@hexnumber{#1}%
- }%
+% Improve error and warning formatting.
 
+%: merged, but ifx yet to see
+\ifx\UTFviii@check@three\@undefined%
  % override message to give the byte in hex
  \def\UTFviii@invalid@err#1{%
-  \PackageError{inputenc}{Invalid UTF-8 byte "\UTFviii@hexbyte{`#1}}%
+  \PackageError{inputenc}{Invalid UTF-8 byte "\UTFviii@hexnumber{`#1}}%
    \UTFviii@invalid@help%
  }%
 \fi%
 
-%: https://github.com/latex3/latex2e/pull/63
-\ifx\UTFviii@hexcodepoint\@undefined%
- % format a number as Unicode codepoint hex
- \gdef\UTFviii@hexcodepoint#1{%
-  \ifnum#1<16 U+000%
-  \else\ifnum#1<256 U+00%
-  \else\ifnum#1<4096 U+0%
-  \else\ifnum#1<65536 U+%
-  \else\ifnum#1<1048576 U-000%
-  \else U-00%
-  \fi\fi\fi\fi\fi%
-  \UTFviii@hexnumber{#1}%
- }%
-
- % override message to format the codepoint correctly
- \gdef\UTFviii@splitcsname#1:#2\relax{%
-  #2 (\expandafter\UTFviii@hexcodepoint\expandafter{%
-   \the\numexpr\decode@UTFviii#2\relax})%
- }%
-\fi%
-
-%: https://github.com/latex3/latex2e/pull/62
-% split an invalid byte sequence for output
-\ifx\UTFviii@splitseq\@undefined%
- \gdef\UTFviii@splitseq#1:#2\relax{%
-  \UTFviii@hexseq#2\relax%
- }%
- \gdef\UTFviii@hexseq#1#2\relax{%
-  % display first octet
-  \space "\UTFviii@hexbyte{`#1}%
-  % recursively handle remaining octets
-  \ifx\relax#2\relax\else\UTFviii@hexseq#2\relax\fi%
- }%
-\fi%
+% override to format a hex Unicode codepoint correctly
+\gdef\UTFviii@hexcodepoint#1{%
+ \ifnum#1<16 U+000%
+ \else\ifnum#1<256 U+00%
+ \else\ifnum#1<4096 U+0%
+ \else\ifnum#1<65536 U+%
+ \else\ifnum#1<1048576 U-000%
+ \else U-00%
+ \fi\fi\fi\fi\fi%
+ \UTFviii@hexnumber{#1}%
+}%
diff --git a/unicodedomino_kernel_fixup_f4_and_checkseq.def b/unicodedomino_kernel_fixup_f4_and_checkseq.def
index 545deae4d197bd3378961af7f87cff78fca662c4..f535b4b50ea0a897049b46531c6b0615a3c56c90 100644
--- a/unicodedomino_kernel_fixup_f4_and_checkseq.def
+++ b/unicodedomino_kernel_fixup_f4_and_checkseq.def
@@ -1,30 +1,13 @@
 % -*- mode: tex -*-
 %-
-% Copyright © 2018
-%	mirabilos <m@mirbsd.org>
-%
-% Provided that these terms and disclaimer and all copyright notices
-% are retained or reproduced in an accompanying document, permission
-% is granted to deal in this work without restriction, including un‐
-% limited rights to use, publicly perform, distribute, sell, modify,
-% merge, give away, or sublicence.
-%
-% This work is provided “AS IS” and WITHOUT WARRANTY of any kind, to
-% the utmost extent permitted by applicable law, neither express nor
-% implied; without malicious intent or gross negligence. In no event
-% may a licensor, author or contributor be held liable for indirect,
-% direct, other damage, loss, or other issues arising in any way out
-% of dealing in the work, even if advised of the possibility of such
-% damage or existence of a defect, except proven that it results out
-% of said person’s immediate fault when using the work as intended.
-%
-% This file is dual-licenced under the LPPL version 1.3c or later.
+% See unicodedomino.sty for copyright and licence terms. Furthermore
+% this file is dual-licenced under the LPPL version 1.3c or later.
 %-
 % Fix check for illegal sequences to fail overlong encoded sequences
 % as well as codepoints outside of the Unicode range [0;10FFFF]. Add
 % "F4 to the list of permitted lead octets.
 
-%: not forwarded yet, will only do so once PR#60 (see below) is in
+%: https://github.com/latex3/latex2e/pull/83
 % new check for illegal sequences
 \gdef\UTFviii@checkseq#1:#2#3\empty{%
  \ifnum`#2<"80 %
@@ -114,7 +97,7 @@
  \fi%
 }%
 
-%: https://github.com/latex3/latex2e/pull/60
+%: fixed upstream
 % bugfix: disallow too large definitions
 \let\unicodedomino@parse@XML@charref\parse@XML@charref%
 \gdef\parse@XML@charref{%
@@ -128,7 +111,7 @@
  \unicodedomino@parse@XML@charref%
 }%
 
-%: https://github.com/latex3/latex2e/pull/60
+%: also merged
 % bugfix: add "F4 to the list of permitted lead octets
 % (needs the above fix)
 \begingroup%