l3 (28aug21)

git-svn-id: svn://tug.org/texlive/trunk@60338 c570f23f-e606-0410-a88d-b1316a301751

50 files changed, 46 insertions, 11 deletions

diff --git a/Master/texmf-dist/doc/latex/l3experimental/CHANGELOG.md b/Master/texmf-dist/doc/latex/l3experimental/CHANGELOG.md
index f9604428a3e..4e557273eab 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/CHANGELOG.md
+++ b/Master/texmf-dist/doc/latex/l3experimental/CHANGELOG.md
@@ -7,6 +7,11 @@ this project uses date-based 'snapshot' version identifiers.
 
 ## [Unreleased]
 
+## [2021-08-27]
+
+### Changed
+- Track message changes in `l3kernel`
+
 ## [2021-08-04]
 
 ### Added
@@ -221,7 +226,8 @@ this project uses date-based 'snapshot' version identifiers.
 - New `l3color` module using `xcolor`-like expression syntax
 - New `l3draw` module, based on `pgf` layer of the TikZ system
 
-[Unreleased]: https://github.com/latex3/latex3/compare/2021-08-04...HEAD
+[Unreleased]: https://github.com/latex3/latex3/compare/2021-08-27...HEAD
+[2021-08-27]: https://github.com/latex3/latex3/compare/2021-08-04...2021-08-27
 [2021-08-04]: https://github.com/latex3/latex3/compare/2021-07-12...2021-08-04
 [2021-07-12]: https://github.com/latex3/latex3/compare/2021-05-27...2021-07-12
 [2021-05-27]: https://github.com/latex3/latex3/compare/2021-02-18...2021-05-27
diff --git a/Master/texmf-dist/doc/latex/l3experimental/README.md b/Master/texmf-dist/doc/latex/l3experimental/README.md
index d08213bef51..38eff7cf661 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/README.md
+++ b/Master/texmf-dist/doc/latex/l3experimental/README.md
@@ -1,7 +1,7 @@
 Experimental LaTeX3 Concepts
 ============================
 
-Release 2021-08-04
+Release 2021-08-27
 
 Overview
 --------
diff --git a/Master/texmf-dist/doc/latex/l3experimental/l3benchmark/l3benchmark.pdf b/Master/texmf-dist/doc/latex/l3experimental/l3benchmark/l3benchmark.pdf
index e7f7c794fa7..157e2cf3a71 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/l3benchmark/l3benchmark.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/l3benchmark/l3benchmark.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/l3bitset/l3bitset.pdf b/Master/texmf-dist/doc/latex/l3experimental/l3bitset/l3bitset.pdf
index 6fe6ea444ab..9b4fadc6caf 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/l3bitset/l3bitset.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/l3bitset/l3bitset.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/l3draw/l3draw-code.pdf b/Master/texmf-dist/doc/latex/l3experimental/l3draw/l3draw-code.pdf
index aabbe3ed243..ac7276ee1e0 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/l3draw/l3draw-code.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/l3draw/l3draw-code.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/l3draw/l3draw.pdf b/Master/texmf-dist/doc/latex/l3experimental/l3draw/l3draw.pdf
index ce3f4c31f81..42e86d08cc4 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/l3draw/l3draw.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/l3draw/l3draw.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/l3graphics/l3graphics.pdf b/Master/texmf-dist/doc/latex/l3experimental/l3graphics/l3graphics.pdf
index 6f50943ec49..a920bded0a4 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/l3graphics/l3graphics.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/l3graphics/l3graphics.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/l3opacity/l3opacity.pdf b/Master/texmf-dist/doc/latex/l3experimental/l3opacity/l3opacity.pdf
index 74fa174c316..cc30509499d 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/l3opacity/l3opacity.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/l3opacity/l3opacity.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/l3str/l3str-format.pdf b/Master/texmf-dist/doc/latex/l3experimental/l3str/l3str-format.pdf
index 991475502ba..07dc9eea04a 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/l3str/l3str-format.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/l3str/l3str-format.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/l3sys-shell/l3sys-shell.pdf b/Master/texmf-dist/doc/latex/l3experimental/l3sys-shell/l3sys-shell.pdf
index cc1493963cf..41b79767a8e 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/l3sys-shell/l3sys-shell.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/l3sys-shell/l3sys-shell.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/xcoffins/xcoffins.pdf b/Master/texmf-dist/doc/latex/l3experimental/xcoffins/xcoffins.pdf
index f4d7fa4ea62..ae301c7c8ba 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/xcoffins/xcoffins.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/xcoffins/xcoffins.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/xgalley/l3galley.pdf b/Master/texmf-dist/doc/latex/l3experimental/xgalley/l3galley.pdf
index 3d80c5565d6..61a9667c91a 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/xgalley/l3galley.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/xgalley/l3galley.pdf
diff --git a/Master/texmf-dist/doc/latex/l3experimental/xgalley/xgalley.pdf b/Master/texmf-dist/doc/latex/l3experimental/xgalley/xgalley.pdf
index 49a84225b16..2d685ddcca6 100644
--- a/Master/texmf-dist/doc/latex/l3experimental/xgalley/xgalley.pdf
+++ b/Master/texmf-dist/doc/latex/l3experimental/xgalley/xgalley.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/CHANGELOG.md b/Master/texmf-dist/doc/latex/l3kernel/CHANGELOG.md
index 903d491f242..7a2a94c9e14 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/CHANGELOG.md
+++ b/Master/texmf-dist/doc/latex/l3kernel/CHANGELOG.md
@@ -7,6 +7,12 @@ this project uses date-based 'snapshot' version identifiers.
 
 ## [Unreleased]
 
+## [2021-08-27]
+
+### Changed
+- Formatting of expandable errors (issue #931)
+- Internal code for kernel messages
+
 ## [2021-07-12]
 
 ### Fixed
@@ -947,7 +953,8 @@ this project uses date-based 'snapshot' version identifiers.
 - Step functions have been added for dim variables,
   e.g. `\dim_step_inline:nnnn`
 
-[Unreleased]: https://github.com/latex3/latex3/compare/2021-07-12...HEAD
+[Unreleased]: https://github.com/latex3/latex3/compare/2021-08-27...HEAD
+[2021-08-27]: https://github.com/latex3/latex3/compare/2021-07-12...2021-08-27
 [2021-07-12]: https://github.com/latex3/latex3/compare/2021-06-18...2021-07-12
 [2021-06-18]: https://github.com/latex3/latex3/compare/2021-06-01...2021-06-18
 [2021-06-01]: https://github.com/latex3/latex3/compare/2021-05-27...2021-06-01
diff --git a/Master/texmf-dist/doc/latex/l3kernel/README.md b/Master/texmf-dist/doc/latex/l3kernel/README.md
index b674bc603f1..ce844e4de6e 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/README.md
+++ b/Master/texmf-dist/doc/latex/l3kernel/README.md
@@ -1,7 +1,7 @@
 LaTeX3 Programming Conventions
 ==============================
 
-Release 2021-07-12
+Release 2021-08-27
 
 Overview
 --------
diff --git a/Master/texmf-dist/doc/latex/l3kernel/expl3.pdf b/Master/texmf-dist/doc/latex/l3kernel/expl3.pdf
index 8f944b1fd25..49fa91c3db1 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/expl3.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/expl3.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/interface3.pdf b/Master/texmf-dist/doc/latex/l3kernel/interface3.pdf
index 75613a8cb1a..1ecc908212f 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/interface3.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/interface3.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/interface3.tex b/Master/texmf-dist/doc/latex/l3kernel/interface3.tex
index 20d24e0d919..7a23b0ef470 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/interface3.tex
+++ b/Master/texmf-dist/doc/latex/l3kernel/interface3.tex
@@ -54,7 +54,7 @@ for those people who are interested.
          {latex-team@latex-project.org}%
    }%
 }
-\date{Released 2021-07-12}
+\date{Released 2021-08-27}
 
 \pagenumbering{roman}
 \maketitle
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3docstrip.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3docstrip.pdf
index e1d85cc04d0..32db07a464d 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3docstrip.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3docstrip.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news.pdf
index d22238c0dd4..1099a4b2ad1 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news01.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news01.pdf
index 70073206a09..1ea1cc2d782 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news01.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news01.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news02.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news02.pdf
index 64d37bc6443..6306bba5e13 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news02.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news02.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news03.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news03.pdf
index 77b6bb22434..f54ec43f121 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news03.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news03.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news04.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news04.pdf
index 62cda66f240..bc18d056df5 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news04.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news04.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news05.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news05.pdf
index 85b9f321cda..591819232a9 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news05.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news05.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news06.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news06.pdf
index b08dc9a31ad..2c8b4210b22 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news06.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news06.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news07.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news07.pdf
index e014af8e0f4..11fe7ee24fa 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news07.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news07.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news08.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news08.pdf
index 4aa1dbfe547..6507f3c1cf8 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news08.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news08.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news09.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news09.pdf
index 72c6f8c483e..d65f8a6479c 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news09.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news09.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news10.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news10.pdf
index 08f15c074e8..46faec805f4 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news10.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news10.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news11.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news11.pdf
index 333a1835d17..e72a8823226 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news11.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news11.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3news12.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3news12.pdf
index 2f7c4c8b944..2914e040016 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3news12.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3news12.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3prefixes.csv b/Master/texmf-dist/doc/latex/l3kernel/l3prefixes.csv
index 3330c62273b..2c1d7cab435 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3prefixes.csv
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3prefixes.csv
@@ -15,9 +15,11 @@ arch,archaeologie,Lukas C. Bossert,http://www.biblatex-archaeologie.de,https://g
 array,hobby,Andrew Stacey,https://github.com/loopspace/hobby,https://github.com/loopspace/hobby,https://github.com/loopspace/hobby/issues,2013-03-16,2020-10-29,
 atsign,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2018-05-12,2018-05-12,
 avm,langsci-avm,Felix Kopecky,https://ctan.org/pkg/langsci-avm,https://github.com/langsci/langsci-avm,https://github.com/langsci/langsci-avm/issues,2020-03-11,2020-03-11,
+babellatin,babel-latin,Keno Wehr,https://ctan.org/pkg/babel-latin,https://github.com/wehro/babel-latin,https://github.com/wehro/babel-latin/issues,2021-08-23,2021-08-23,
 backend,l3backend,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2019-06-04,2019-06-04,
 backslash,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2018-05-12,2018-05-12,
 bearwear,bearwear,Ulrike Fischer,https://github.com/u-fischer/bearwear,https://github.com/u-fischer/bearwear,https://github.com/u-fischer/bearwear/issues,2020-04-24,2020-04-24,
+beuron,beuron,Keno Wehr,https://ctan.org/pkg/beuron,,,2021-08-23,2021-08-23,
 bitset,l3kernel,The LaTeX3 Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2020-12-26,2020-12-26,
 bool,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2012-09-27,2012-09-27,
 box,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2012-09-27,2012-09-27,
@@ -65,6 +67,7 @@ emojicite,emojicite,Leon Sixt,https://github.com/berleon/emojicite,https://githu
 empty,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2018-05-12,2018-05-12,
 enotez,enotez,Clemens Niederberger,https://github.com/cgnieder/enotez/,https://github.com/cgnieder/enotez.git,https://github.com/cgnieder/enotez/issues,2013-03-16,2020-04-14,
 etex,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2012-09-27,2012-09-27,
+etl,etl,Jonathan P. Spratte,https://github.com/Skillmon/ltx_etl,git@github.com:Skillmon/ltx_etl.git,https://github.com/Skillmon/ltx_etl/issues,2021-08-16,2021-08-16,
 exp,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2012-09-27,2012-09-27,
 expl,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2012-09-27,2012-09-27,
 exsheets,exsheets,Clemens Niederberger,https://bitbucket.org/cgnieder/exsheets/,git@bitbucket.org:cgnieder/exsheets.git,https://bitbucket.org/cgnieder/exsheets/issues,2013-03-16,2013-03-16,
@@ -115,6 +118,7 @@ keys,"l3kernel,l3keys2e",The LaTeX Project,https://www.latex-project.org/latex3.
 keyval,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2012-09-27,2012-09-27,
 kgl,kantlipsum,Enrico Gregorio,,,,2013-03-16,2013-03-16,
 kivitendo,"kiviletter, kivitables",Marei Peischl for Kivitendo,https://www.kivitendo.de/,https://github.com/kivitendo/kivitendo-erp,https://forum.kivitendo.de/,2021-05-28,2021-05-28,
+langsci,langscibook ,Language Science Press,https://langsci-press.org,https://github.com/langsci/langscibook,https://github.com/langsci/langscibook/issues,2021-07-20,2021-07-21,
 left,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2018-05-12,2018-05-12,
 lltxmath,lualatex-math,Philipp Stephani,https://github.com/phst/lualatex-math,https://github.com/phst/lualatex-math.git,https://github.com/phst/lualatex-math/issues,2012-11-07,2012-11-07,
 log,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2018-05-12,2018-05-12,
@@ -167,6 +171,7 @@ peek,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https:
 percent,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2018-05-12,2018-05-12,
 pgf,pgf,The PGF/TikZ Team,https://pgf-tikz.github.io,https://github.com/pgf-tikz/pgf,https://github.com/pgf-tikz/pgf/issues,2020-07-03,2020-07-03,
 pgfmxfp,pgfmath-xfp,Jonathan P. Spratte,https://github.com/Skillmon/ltx_pgfmath-xfp,https://github.com/Skillmon/ltx_pgfmath-xfp,https://github.com/Skillmon/ltx_pgfmath-xfp/issues,2021-05-20,2021-05-20,
+phone,phonenumbers,Keno Wehr,https://ctan.org/pkg/phonenumbers,https://github.com/wehro/phonenumbers,https://github.com/wehro/phonenumbers/issues,2021-08-23,2021-08-23,
 pi,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2018-05-12,2018-05-12,
 pkgploader,pkgploader,Michiel Helvensteijn,,,,2014-02-05,2014-02-05,
 platex,platex,Japanese TeX Development Community,https://github.com/texjporg/platex,https://github.com/texjporg/platex.git,https://github.com/texjporg/platex/issues,2020-09-30,2020-09-30,
@@ -189,6 +194,7 @@ right,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https
 rivbook,rivbook,Julien Rivaud,,,,2018-06-13,2018-06-14,
 rivmath,rivmath,Julien Rivaud,,,,2018-06-13,2018-06-13,
 scan,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2012-09-27,2012-09-27,
+schulma,schulmathematik,Keno Wehr,https://ctan.org/pkg/schulmathematik,,,2021-08-23,2021-08-23,
 scontents,scontents,Pablo González,https://github.com/pablgonz/scontents,git@github.com:pablgonz/scontents.git,https://github.com/pablgonz/scontents/issues,2019-12-05,2019-12-05,
 sdaps,sdaps,Benjamin Berg,https://sdaps.org,https://github.com/sdaps/sdaps-class.git,https://github.com/sdaps/sdaps-class/issues,2020-02-17,2020-02-17,
 seq,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2012-09-27,2012-09-27,
@@ -246,4 +252,5 @@ yoin,yoin,Tom Hejda,https://github.com/tohecz/yoin,https://github.com/tohecz/yoi
 zero,l3kernel,The LaTeX Project,https://www.latex-project.org/latex3.html,https://github.com/latex3/latex3.git,https://github.com/latex3/latex3/issues,2018-05-12,2018-05-12,
 zhlipsum,zhlipsum,Xiangdong Zeng,https://github.com/stone-zeng/zhlipsum,https://github.com/stone-zeng/zhlipsum.git,https://github.com/stone-zeng/zhlipsum/issues,2018-06-14,2018-06-14,
 zhnum,zhnumber,Qing Lee,https://github.com/CTeX-org/ctex-kit,https://github.com/CTeX-org/ctex-kit.git,https://github.com/CTeX-org/ctex-kit/issues,2013-03-16,2013-05-26,
+zrefcheck,zref-check,Gustavo Barros,https://github.com/gusbrs/zref-check,https://github.com/gusbrs/zref-check,https://github.com/gusbrs/zref-check/issues,2021-08-05,2021-08-05,
 zxjt,zxjatype,Takayuki Yato,,,,2013-03-16,2013-03-16,
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3prefixes.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3prefixes.pdf
index 03c390a8d63..509e23643c5 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3prefixes.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3prefixes.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3styleguide.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3styleguide.pdf
index b6697e99495..bc876bf255f 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3styleguide.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3styleguide.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3styleguide.tex b/Master/texmf-dist/doc/latex/l3kernel/l3styleguide.tex
index 786296bd3a2..44547e3fd27 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3styleguide.tex
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3styleguide.tex
@@ -32,7 +32,7 @@ The released version of this bundle is available from CTAN.
         {latex-team@latex-project.org}%
     }%
 }
-\date{Released 2021-07-12}
+\date{Released 2021-08-27}
 
 \begin{document}
 
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3syntax-changes.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3syntax-changes.pdf
index a1f156a8bdc..3a8c7d5b609 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3syntax-changes.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3syntax-changes.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3syntax-changes.tex b/Master/texmf-dist/doc/latex/l3kernel/l3syntax-changes.tex
index 7159309d36d..b0248031987 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3syntax-changes.tex
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3syntax-changes.tex
@@ -32,7 +32,7 @@ The released version of this bundle is available from CTAN.
         {latex-team@latex-project.org}%
     }%
 }
-\date{Released 2021-07-12}
+\date{Released 2021-08-27}
 
 \newcommand{\TF}{\textit{(TF)}}
 
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3term-glossary.pdf b/Master/texmf-dist/doc/latex/l3kernel/l3term-glossary.pdf
index 915031ea1a0..a6b64eab91c 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3term-glossary.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3term-glossary.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/l3term-glossary.tex b/Master/texmf-dist/doc/latex/l3kernel/l3term-glossary.tex
index 5830f4e7c3a..b449c5ae26d 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/l3term-glossary.tex
+++ b/Master/texmf-dist/doc/latex/l3kernel/l3term-glossary.tex
@@ -32,7 +32,7 @@ The released version of this bundle is available from CTAN.
         {latex-team@latex-project.org}%
     }%
 }
-\date{Released 2021-07-12}
+\date{Released 2021-08-27}
 
 \newcommand{\TF}{\textit{(TF)}}
 
diff --git a/Master/texmf-dist/doc/latex/l3kernel/source3.pdf b/Master/texmf-dist/doc/latex/l3kernel/source3.pdf
index 447e74fb345..78acace709d 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/source3.pdf
+++ b/Master/texmf-dist/doc/latex/l3kernel/source3.pdf
diff --git a/Master/texmf-dist/doc/latex/l3kernel/source3.tex b/Master/texmf-dist/doc/latex/l3kernel/source3.tex
index ca9255d6e4c..e3695dcdbbc 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/source3.tex
+++ b/Master/texmf-dist/doc/latex/l3kernel/source3.tex
@@ -53,7 +53,7 @@ for those people who are interested.
          {latex-team@latex-project.org}%
    }%
 }
-\date{Released 2021-07-12}
+\date{Released 2021-08-27}
 
 \pagenumbering{roman}
 \maketitle
diff --git a/Master/texmf-dist/doc/latex/l3kernel/source3body.tex b/Master/texmf-dist/doc/latex/l3kernel/source3body.tex
index 946f7a4abca..a2e87856bd7 100644
--- a/Master/texmf-dist/doc/latex/l3kernel/source3body.tex
+++ b/Master/texmf-dist/doc/latex/l3kernel/source3body.tex
@@ -328,6 +328,15 @@ following variable types:
   \item[\texttt{regex}] Regular expression.
 \end{description}
 
+\subsection{Scratch variables}
+
+Modules focussed on variable usage typically provide four scratch variables,
+two local and two global, with names of the form
+\cs{\meta{scope}_tmpa_\meta{type}}/\cs{\meta{scope}_tmpb_\meta{type}}. These
+are never used by the core code. The nature of \TeX{} grouping means that as
+with any other scratch variable, these should only be set and used with no
+intervening third-party code.
+
 \subsection{Terminological inexactitude}
 
 A word of warning. In this document, and others referring to the \pkg{expl3}
diff --git a/Master/texmf-dist/doc/latex/l3packages/CHANGELOG.md b/Master/texmf-dist/doc/latex/l3packages/CHANGELOG.md
index 8b9928d6488..9b7487dc515 100644
--- a/Master/texmf-dist/doc/latex/l3packages/CHANGELOG.md
+++ b/Master/texmf-dist/doc/latex/l3packages/CHANGELOG.md
@@ -7,6 +7,11 @@ this project uses date-based 'snapshot' version identifiers.
 
 ## [Unreleased]
 
+## [2021-08-27]
+
+### Changed
+- Track message changes in `l3kernel`
+
 ## [2021-08-04]
 
 ### Changed
@@ -154,7 +159,8 @@ this project uses date-based 'snapshot' version identifiers.
 - Switch to ISO date format
 - Improve cross-module use of internal functions
 
-[Unreleased]: https://github.com/latex3/latex3/compare/2021-08-04...HEAD
+[Unreleased]: https://github.com/latex3/latex3/compare/2021-08-27...HEAD
+[2021-08-27]: https://github.com/latex3/latex3/compare/2021-08-04...2021-08-27
 [2021-08-04]: https://github.com/latex3/latex3/compare/2021-06-18...2021-08-04
 [2021-06-18]: https://github.com/latex3/latex3/compare/2021-06-01...2021-06-18
 [2021-06-01]: https://github.com/latex3/latex3/compare/2021-05-27...2021-06-01
diff --git a/Master/texmf-dist/doc/latex/l3packages/README.md b/Master/texmf-dist/doc/latex/l3packages/README.md
index 316526984bf..d20f9f83bee 100644
--- a/Master/texmf-dist/doc/latex/l3packages/README.md
+++ b/Master/texmf-dist/doc/latex/l3packages/README.md
@@ -1,7 +1,7 @@
 LaTeX3 High-Level Concepts
 ==========================
 
-Release 2021-08-04
+Release 2021-08-27
 
 Overview
 --------
diff --git a/Master/texmf-dist/doc/latex/l3packages/l3keys2e/l3keys2e.pdf b/Master/texmf-dist/doc/latex/l3packages/l3keys2e/l3keys2e.pdf
index 6cba692ad10..587e3201c27 100644
--- a/Master/texmf-dist/doc/latex/l3packages/l3keys2e/l3keys2e.pdf
+++ b/Master/texmf-dist/doc/latex/l3packages/l3keys2e/l3keys2e.pdf
diff --git a/Master/texmf-dist/doc/latex/l3packages/xfp/xfp.pdf b/Master/texmf-dist/doc/latex/l3packages/xfp/xfp.pdf
index 293ba0ff0ee..cd5a23f6014 100644
--- a/Master/texmf-dist/doc/latex/l3packages/xfp/xfp.pdf
+++ b/Master/texmf-dist/doc/latex/l3packages/xfp/xfp.pdf
diff --git a/Master/texmf-dist/doc/latex/l3packages/xfrac/xfrac.pdf b/Master/texmf-dist/doc/latex/l3packages/xfrac/xfrac.pdf
index c0ec5bd0488..2895df4613f 100644
--- a/Master/texmf-dist/doc/latex/l3packages/xfrac/xfrac.pdf
+++ b/Master/texmf-dist/doc/latex/l3packages/xfrac/xfrac.pdf
diff --git a/Master/texmf-dist/doc/latex/l3packages/xparse/xparse.pdf b/Master/texmf-dist/doc/latex/l3packages/xparse/xparse.pdf
index 551520d0231..139e90a8737 100644
--- a/Master/texmf-dist/doc/latex/l3packages/xparse/xparse.pdf
+++ b/Master/texmf-dist/doc/latex/l3packages/xparse/xparse.pdf
diff --git a/Master/texmf-dist/doc/latex/l3packages/xtemplate/xtemplate.pdf b/Master/texmf-dist/doc/latex/l3packages/xtemplate/xtemplate.pdf
index 2fc25bc8ba3..dd14606df02 100644
--- a/Master/texmf-dist/doc/latex/l3packages/xtemplate/xtemplate.pdf
+++ b/Master/texmf-dist/doc/latex/l3packages/xtemplate/xtemplate.pdf