l3 (21feb20)

git-svn-id: svn://tug.org/texlive/trunk@53862 c570f23f-e606-0410-a88d-b1316a301751

56 files changed, 106 insertions, 84 deletions

diff --git a/Master/texmf-dist/source/latex/l3build/l3build.dtx b/Master/texmf-dist/source/latex/l3build/l3build.dtx
index f00774cada1..56bcbb9243f 100644
--- a/Master/texmf-dist/source/latex/l3build/l3build.dtx
+++ b/Master/texmf-dist/source/latex/l3build/l3build.dtx
@@ -233,7 +233,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-17}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 % \tableofcontents
@@ -1776,9 +1776,15 @@
 % \end{variable}
 %
 % \begin{variable}{os_yes}
-%   A command to generate a series of $200$ lines each containing the
+%   \textbf{DEPRECATED}
+%   A command to generate a series of $300$ lines each containing the
 %   character |y|: this is useful as the Unix |yes| command cannot be
 %   used inside |os.execute| (it does not terminate).
+%
+%  Rather than use this function, we recommend the replacement construct
+%  \begin{verbatim}
+%    io.popen(<cmd>,"w"):write(string.rep("y\n", 300)):close()
+%  \end{verbatim}   
 % \end{variable}
 %
 % \subsection{Components of \texttt{l3build}}
diff --git a/Master/texmf-dist/source/latex/l3kernel/expl3.dtx b/Master/texmf-dist/source/latex/l3kernel/expl3.dtx
index 67e22ca6396..c266a2c2da2 100644
--- a/Master/texmf-dist/source/latex/l3kernel/expl3.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/expl3.dtx
@@ -24,7 +24,7 @@
 %
 %<*driver|generic|package|2ekernel>
 %</driver|generic|package|2ekernel>
-\def\ExplFileDate{2020-02-14}%
+\def\ExplFileDate{2020-02-21}%
 %<*driver>
 \documentclass[full]{l3doc}
 \usepackage{graphicx}
@@ -51,7 +51,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -922,6 +922,12 @@
 %   \item[xdvipdfmx] Use the \texttt{xdvipdfmx} driver (\XeTeX{} only).
 % \end{itemize}
 %
+% \DescribeOption{suppress-backend-headers}
+% The \texttt{suppress-backend-headers} option suppresses loading of
+% backend-specific header files; currently this only affects \texttt{dvips}.
+% This option is available to support DVI-based routes that do not
+% support the |header| line used by \texttt{dvips}.
+%
 % \section{Using \pkg{expl3} with formats other than \LaTeXe{}}
 %
 % As well as the \LaTeXe{} package \pkg{expl3}, there is also a
@@ -1119,7 +1125,7 @@
 % Loading with \LaTeXe{} may be as part of the format (pre-loading)
 % or as a package. We have to allow for both possible paths, and of
 % course the package being loaded on to of the pre-load. That means
-% the the code here must be safe against re-loading.
+% the code here must be safe against re-loading.
 %
 %    \begin{macrocode}
 %<*package&loader|2ekernel>
@@ -1244,7 +1250,8 @@
 % \begin{variable}{\l_@@_options_clist}
 %    \begin{macrocode}
 %<*!2ekernel>
-\clist_new:N \l_@@_options_clist
+\cs_if_exist:NF \l_@@_options_clist
+  { \clist_new:N \l_@@_options_clist }
 \DeclareOption*
   { \clist_put_right:NV \l_@@_options_clist \CurrentOption }
 \ProcessOptions \relax
@@ -1272,10 +1279,13 @@
         \sys_load_debug:
         \debug_on:n { log-functions }
       } ,
+    suppress-backend-headers .bool_set_inverse:N
+      = \g__kernel_backend_header_bool ,
+    suppress-backend-headers .initial:n = false ,
     undo-recent-deprecations .code:n =
       {
-        \sys_load_deprecation:
         \bool_gset_true:N \g__kernel_deprecation_undo_recent_bool
+        \sys_load_deprecation:
       }
   }
 %    \end{macrocode}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3alloc.dtx b/Master/texmf-dist/source/latex/l3kernel/l3alloc.dtx
index 57febba3983..8796c5b8c7c 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3alloc.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3alloc.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3basics.dtx b/Master/texmf-dist/source/latex/l3kernel/l3basics.dtx
index af0a47b3c23..5ecb409f515 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3basics.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3basics.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -1067,7 +1067,7 @@
 %    \cs{use_none_delimit_by_q_stop:w} \meta{balanced text} \cs{q_stop}
 %    \cs{use_none_delimit_by_q_recursion_stop:w} \meta{balanced text} \cs{q_recursion_stop}
 %   \end{syntax}
-%   Absorb the \meta{balanced text} form the input stream delimited by
+%   Absorb the \meta{balanced text} from the input stream delimited by
 %   the marker given in the function name, leaving nothing in the
 %   input stream.
 % \end{function}
@@ -1083,7 +1083,7 @@
 %    \cs{use_i_delimit_by_q_stop:nw} \Arg{inserted tokens} \meta{balanced text} \cs{q_stop}
 %    \cs{use_i_delimit_by_q_recursion_stop:nw} \Arg{inserted tokens} \meta{balanced text} \cs{q_recursion_stop}
 %   \end{syntax}
-%   Absorb the \meta{balanced text} form the input stream delimited by
+%   Absorb the \meta{balanced text} from the input stream delimited by
 %   the marker given in the function name, leaving \meta{inserted tokens}
 %   in the input stream for further processing.
 % \end{function}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3bootstrap.dtx b/Master/texmf-dist/source/latex/l3kernel/l3bootstrap.dtx
index 20da5f69c4d..4b78f7addb0 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3bootstrap.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3bootstrap.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3box.dtx b/Master/texmf-dist/source/latex/l3kernel/l3box.dtx
index fd426abaa42..cc7fd1e691e 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3box.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3box.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3candidates.dtx b/Master/texmf-dist/source/latex/l3kernel/l3candidates.dtx
index 1191a45bd57..5fff9397277 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3candidates.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3candidates.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3clist.dtx b/Master/texmf-dist/source/latex/l3kernel/l3clist.dtx
index 5d2354960e9..7b498b2acd6 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3clist.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3clist.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3coffins.dtx b/Master/texmf-dist/source/latex/l3kernel/l3coffins.dtx
index 2689143b69e..1b49492b345 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3coffins.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3coffins.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3color-base.dtx b/Master/texmf-dist/source/latex/l3kernel/l3color-base.dtx
index 39c172e86ce..6ee0980269f 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3color-base.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3color-base.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3debug.dtx b/Master/texmf-dist/source/latex/l3kernel/l3debug.dtx
index cbb89789628..fc5ef284979 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3debug.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3debug.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3deprecation.dtx b/Master/texmf-dist/source/latex/l3kernel/l3deprecation.dtx
index 31532367330..8a3e8cce006 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3deprecation.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3deprecation.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -558,6 +558,10 @@
 % \subsection{Loading the patches}
 %
 % When loaded first, the patches are simply read here.
+% Here the deprecation code is loaded with the lower-level |\__kernel_...|
+% macro because we don't want it to flip the \cs{g__sys_deprecation_bool}
+% boolean, so that the deprecation code can be re-loaded later (when using
+% \texttt{undo-recent-deprecations}).
 %
 %    \begin{macrocode}
 \group_begin:
@@ -575,7 +579,7 @@
   }
 \cs_gset_protected:Npn \__kernel_sys_configuration_load:n #1
   { \file_input:n { #1 .def } }
-\sys_load_deprecation:
+\__kernel_sys_configuration_load:n { l3deprecation }
 %    \end{macrocode}
 %
 %    \begin{macrocode}
@@ -1060,7 +1064,7 @@
 % \begin{macro}[EXP, deprecated = 2021-07-01]{\c_term_ior}
 %    \begin{macrocode}
 \__kernel_patch_deprecation:nnNNpn { 2021-01-01 } { -1 }
-\cs_new_protected:Npn \c_term_ior { -1 \scan_stop: }
+\cs_gset_protected:Npn \c_term_ior { -1 \scan_stop: }
 %    \end{macrocode}
 % \end{macro}
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3doc.dtx b/Master/texmf-dist/source/latex/l3kernel/l3doc.dtx
index 77064b0c229..83c140a7ea5 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3doc.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3doc.dtx
@@ -79,7 +79,7 @@ and all files in that bundle must be distributed together.
 %
 % \title{The \cls{l3doc} class}
 % \author{\Team}
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 % \maketitle
 % \tableofcontents
 %
@@ -217,7 +217,7 @@ and all files in that bundle must be distributed together.
 %
 % This isn't very flexible, since it assumes that we \emph{always} want
 % to print the documentation.  For the \pkg{expl3} sources, I wanted to
-% be be able to input \file{.dtx} files in two modes: only displaying
+%  be able to input \file{.dtx} files in two modes: only displaying
 % the documentation, and only displaying the implementation.  For
 % example:
 % \begin{verbatim}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3docstrip.dtx b/Master/texmf-dist/source/latex/l3kernel/l3docstrip.dtx
index 014ce1cdfe1..43ce8249f3b 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3docstrip.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3docstrip.dtx
@@ -63,7 +63,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3expan.dtx b/Master/texmf-dist/source/latex/l3kernel/l3expan.dtx
index dfd69c140b9..272e1cc400d 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3expan.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3expan.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3file.dtx b/Master/texmf-dist/source/latex/l3kernel/l3file.dtx
index 700542c8e82..5eb3f687302 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3file.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3file.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3final.dtx b/Master/texmf-dist/source/latex/l3kernel/l3final.dtx
index 4fcfa233a0d..5cd15dca48f 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3final.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3final.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3flag.dtx b/Master/texmf-dist/source/latex/l3kernel/l3flag.dtx
index 20e4a536aed..23cd8127c03 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3flag.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3flag.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-assign.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-assign.dtx
index 3dd85c77ddf..a3aff3c74b7 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-assign.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-assign.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 % \maketitle
 %
 % \begin{documentation}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-aux.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-aux.dtx
index de6ecdb2dfc..fe6932aaebb 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-aux.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-aux.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-basics.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-basics.dtx
index 87083fb6ff3..6c62694b260 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-basics.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-basics.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -1575,7 +1575,7 @@
 %   first approximation of the square root of the significand $10^{8}
 %   a_1 + a_2 = 10^{8} |#2#3| + |#4#5|$ through Newton's method,
 %   starting at $x = 57234133 \simeq 10^{7.75}$.  Otherwise, first shift
-%   the significand of of the argument by one digit, getting
+%   the significand of the argument by one digit, getting
 %   $a_1'\in[10^{6}, 10^{7})$ instead of $[10^{7}, 10^{8})$, then use
 %   Newton's method starting at $17782794 \simeq 10^{7.25}$.
 %    \begin{macrocode}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-convert.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-convert.dtx
index 38398f5c983..2be36397e08 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-convert.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-convert.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-expo.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-expo.dtx
index c409db18b7a..dd709983db9 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-expo.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-expo.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-extended.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-extended.dtx
index a59acfbd227..0c8f1db628e 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-extended.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-extended.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-logic.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-logic.dtx
index 315b21d5431..4b171ec6136 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-logic.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-logic.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-parse.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-parse.dtx
index 7118c0bad24..d370a148e0b 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-parse.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-parse.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-random.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-random.dtx
index 4b46f545fbf..4e1886893bb 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-random.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-random.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-round.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-round.dtx
index a787adfb945..d73aa6de7c4 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-round.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-round.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-traps.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-traps.dtx
index 4eb0387a16d..56c0d733493 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-traps.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-traps.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 % \maketitle
 %
 % \begin{documentation}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp-trig.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp-trig.dtx
index 2be7c7805ee..f680dd9df1e 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp-trig.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp-trig.dtx
@@ -40,7 +40,7 @@
 %          {latex-team@latex-project.org}^^A
 %    }^^A
 % }
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fp.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fp.dtx
index 2cfa4be0722..6ad7be9b401 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fp.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fp.dtx
@@ -49,7 +49,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -1135,7 +1135,7 @@
 %         towards positive infinity});
 %     \item |trunc| yields a multiple
 %       of~$10^{-n}$ with the same sign as~$x$ and with the largest
-%       absolute value less that that of~$x$ (\enquote{round towards
+%       absolute value less than that of~$x$ (\enquote{round towards
 %         zero}).
 %   \end{itemize}
 %   \enquote{Overflow} occurs if $x$~is finite and the result is
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3fparray.dtx b/Master/texmf-dist/source/latex/l3kernel/l3fparray.dtx
index 8b5f3360044..91e6645f070 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3fparray.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3fparray.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -151,7 +151,7 @@
 %
 % \begin{macro}{\fparray_new:Nn, \fparray_new:cn}
 % \begin{macro}{\@@_array_new:nNNN}
-%   Build a three token token list, then define all three tokens to be
+%   Build a three-token token list, then define all three tokens to be
 %   integer arrays of the same size.  No need to initialize the data:
 %   the integer arrays start with zeros, and three zeros denote
 %   precisely \cs{c_zero_fp}, as we want.
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3int.dtx b/Master/texmf-dist/source/latex/l3kernel/l3int.dtx
index d08ea5e3da7..748d0c0f1cd 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3int.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3int.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3intarray.dtx b/Master/texmf-dist/source/latex/l3kernel/l3intarray.dtx
index 6409bf8579e..442c2d71d4c 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3intarray.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3intarray.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx b/Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx
index 349cfdcbf30..8b61579016a 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3kernel-functions.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -130,7 +130,7 @@
 %     \cs{__kernel_file_missing:n} \Arg{name}
 %   \end{syntax}
 %   Expands the \meta{name} as per \cs{__kernel_file_name_sanitize:nN} then
-%   produces an error message indicating that that file was not found.
+%   produces an error message indicating that this file was not found.
 % \end{function}
 %
 % \begin{function}{\__kernel_file_name_sanitize:nN}
@@ -475,13 +475,6 @@
 %   pair.
 % \end{function}
 %
-% \begin{function}{\__kernel_backend_postscript_header:n}
-%   \begin{syntax}
-%     \cs{__kernel_backend_postscript_header:n} \Arg{PostScript}
-%   \end{syntax}
-%   Adds the \meta{PostScript} to the PostScript header.
-% \end{function}
-%
 % \begin{function}{\__kernel_backend_align_begin:, \__kernel_backend_align_end:}
 %   \begin{syntax}
 %     \cs{__kernel_backend_align_begin:}
@@ -511,6 +504,10 @@
 %   Applies the \meta{matrix} to the current transformation matrix.
 % \end{function}
 %
+% \begin{function}{\g__kernel_backend_header_bool}
+%   Specifies whether to write headers for the backend.
+% \end{function}
+%
 % \begin{function}{\l__kernel_color_stack_int}
 %   The color stack used in \pdfTeX{} and \LuaTeX{} for the main color.
 % \end{function}
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3keys.dtx b/Master/texmf-dist/source/latex/l3kernel/l3keys.dtx
index 6d4dccb440f..aaccd9718d2 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3keys.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3keys.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -1086,7 +1086,7 @@
 %   actually being a key. For the value, we first need to see if there is
 %   anything to do: if there is, extract it. The appropriate action is then
 %   inserted in front of the key and value. Doing this using an assignment is
-%   marginally faster than an an expansion chain.
+%   marginally faster than an expansion chain.
 %    \begin{macrocode}
 \cs_new_protected:Npn \@@_split:NNw #1#2#3 =
   {
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3legacy.dtx b/Master/texmf-dist/source/latex/l3kernel/l3legacy.dtx
index dbbcf148023..3ba72753cf3 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3legacy.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3legacy.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx b/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx
index eadbf4d826a..7363dd07f6e 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3luatex.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3msg.dtx b/Master/texmf-dist/source/latex/l3kernel/l3msg.dtx
index 9066ec39e5e..b61d5355455 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3msg.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3msg.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -1192,7 +1192,7 @@
 %   there is |\\>~| (or if the whole thing starts with |>~|) we split
 %   there, print the first part and show the second part using
 %   \tn{showtokens} (the \cs{exp_after:wN} ensure a nice display).  Note
-%   that that primitive adds a leading |>~| and trailing dot.  That is
+%   that this primitive adds a leading |>~| and trailing dot.  That is
 %   why we included a trailing dot before wrapping and removed it
 %   afterwards.  If there is no |\\>~| do the same but with an empty
 %   second part which adds a spurious but inevitable |>~.|
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3names.dtx b/Master/texmf-dist/source/latex/l3kernel/l3names.dtx
index c914e088874..d04977a2510 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3names.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3names.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3prg.dtx b/Master/texmf-dist/source/latex/l3kernel/l3prg.dtx
index db1d872e981..d886d7c508c 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3prg.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3prg.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3prop.dtx b/Master/texmf-dist/source/latex/l3kernel/l3prop.dtx
index b8fc20d3a1c..7607e9eabca 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3prop.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3prop.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3quark.dtx b/Master/texmf-dist/source/latex/l3kernel/l3quark.dtx
index bea3d69c65d..7250f1663b8 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3quark.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3quark.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3regex.dtx b/Master/texmf-dist/source/latex/l3kernel/l3regex.dtx
index d35f1b4be0b..ffbbfae3caa 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3regex.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3regex.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3seq.dtx b/Master/texmf-dist/source/latex/l3kernel/l3seq.dtx
index 296d40ee58d..9aa2cf8ebaf 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3seq.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3seq.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3skip.dtx b/Master/texmf-dist/source/latex/l3kernel/l3skip.dtx
index 96f6ceb9a99..41622bf0b6b 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3skip.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3skip.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3sort.dtx b/Master/texmf-dist/source/latex/l3kernel/l3sort.dtx
index 989645cd9d4..87f555b59c6 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3sort.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3sort.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3str-convert.dtx b/Master/texmf-dist/source/latex/l3kernel/l3str-convert.dtx
index db1a1466023..374d33e7d90 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3str-convert.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3str-convert.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3str.dtx b/Master/texmf-dist/source/latex/l3kernel/l3str.dtx
index 3d1003d8acf..4be3042bcdc 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3str.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3str.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx b/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
index 7c8820426cf..0b8e4879556 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3sys.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -412,7 +412,11 @@
   {
     \sys_if_engine_xetex:TF
       {
-        \str_if_eq:VnF #1 { xdvipdfmx }
+        \str_case:VnF #1
+          {
+            { dvisvgm }   { }
+            { xdvipdfmx } { }
+          }
           {
             \__kernel_msg_error:nnxx { sys } { wrong-backend }
               #1 { xdvipdfmx }
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3text-case.dtx b/Master/texmf-dist/source/latex/l3kernel/l3text-case.dtx
index 0bdeab6210e..46c11330f16 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3text-case.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3text-case.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3text.dtx b/Master/texmf-dist/source/latex/l3kernel/l3text.dtx
index e1e507f2226..66279f7fff9 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3text.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3text.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -156,9 +156,10 @@
 %       I-dot and introduced when upper casing i-dotless.
 %     \item German (\texttt{de-alt}).
 %       An alternative mapping for German in which the lowercase
-%       \emph{Eszett} maps to a \emph{gro\ss{}es Eszett}. This transformation
-%       is available using \pdfTeX{} as there is a |T1| slot for the
-%       result.
+%       \emph{Eszett} maps to a \emph{gro\ss{}es Eszett}. Since there is
+%       a |T1| slot for the \emph{gro\ss{}es Eszett} in |T1|, this
+%       tailoring \emph{is} available with \pdfTeX{} as well as in the
+%       Unicode \TeX{} engines.
 %     \item Greek (\texttt{el}).
 %       Removes accents from Greek letters when uppercasing; titlecasing
 %       leaves accents in place.
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3tl-analysis.dtx b/Master/texmf-dist/source/latex/l3kernel/l3tl-analysis.dtx
index f878bd1e497..23017b37da9 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3tl-analysis.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3tl-analysis.dtx
@@ -44,7 +44,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3tl.dtx b/Master/texmf-dist/source/latex/l3kernel/l3tl.dtx
index 76ee3fbfcd0..f9a85ab2a8a 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3tl.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3tl.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3token.dtx b/Master/texmf-dist/source/latex/l3kernel/l3token.dtx
index aa34d2b0727..d3ce452a0e6 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3token.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3token.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %
@@ -1523,7 +1523,7 @@
       \int_step_function:nnN { 0 } { 255 }  \@@_tmp:n
 %</initex>
 %    \end{macrocode}
-%   As \TeX{} is very unhappy if if finds an alignment character inside
+%   As \TeX{} is very unhappy if it finds an alignment character inside
 %   a primitive \tn{halign} even when skipping false branches, some
 %   precautions are required. \TeX{} is happy if the token is hidden
 %   between braces within \cs{if_false:} \dots{} \cs{fi:}.
diff --git a/Master/texmf-dist/source/latex/l3kernel/l3unicode.dtx b/Master/texmf-dist/source/latex/l3kernel/l3unicode.dtx
index 5354b5b4f9e..1578cbaf79f 100644
--- a/Master/texmf-dist/source/latex/l3kernel/l3unicode.dtx
+++ b/Master/texmf-dist/source/latex/l3kernel/l3unicode.dtx
@@ -43,7 +43,7 @@
 %    }^^A
 % }
 %
-% \date{Released 2020-02-14}
+% \date{Released 2020-02-21}
 %
 % \maketitle
 %