diff --git a/base/testfiles/github-0944.tlg b/base/testfiles/github-0944.tlg
index da35ffaa3..3b1dc14f8 100644
--- a/base/testfiles/github-0944.tlg
+++ b/base/testfiles/github-0944.tlg
@@ -22,7 +22,7 @@ LaTeX Warning: Reference `unknown' on page 1 undefined on input line ....
 ] (github-0944.aux)
  ***********
 -formatname- <-formatversion-> patch level -2
-L3 programming layer <2024-06-19>
+L3 programming layer <2024-07-20>
  ***********
  *File List*
  -show the file list here-
diff --git a/texmf/tex/latex/l3kernel/expl3-code.tex b/texmf/tex/latex/l3kernel/expl3-code.tex
index b90d7551a..54aa898cc 100644
--- a/texmf/tex/latex/l3kernel/expl3-code.tex
+++ b/texmf/tex/latex/l3kernel/expl3-code.tex
@@ -75,7 +75,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: expl3.dtx
-\def\ExplFileDate{2024-06-19}%
+\def\ExplFileDate{2024-07-20}%
 \begingroup
   \def\next{\endgroup}%
   \expandafter\ifx\csname PackageError\endcsname\relax
@@ -13859,7 +13859,8 @@
   {
     \bool_if:NTF \l__keys_no_value_bool
       {
-        \__keys_define_code:TF
+        \__keys_define_code:nnn
+          { \use:c { \c__keys_props_root_str \l__keys_property_str } {#1} }
           { \use:c { \c__keys_props_root_str \l__keys_property_str } }
           {
             \msg_error:nnee { keys } { property-requires-value }
@@ -13868,7 +13869,7 @@
       }
       { \use:c { \c__keys_props_root_str \l__keys_property_str } {#1} }
   }
-\cs_new:Npe \__keys_define_code:TF
+\cs_new:Npe \__keys_define_code:nnn
   {
     \exp_not:N \exp_after:wN \exp_not:N \__keys_define_code:w
       \exp_not:N \l__keys_property_str
@@ -13880,7 +13881,15 @@
     \cs_new:Npn \exp_not:N \__keys_define_code:w
       #1 \c_colon_str #2 \c_colon_str #3 \exp_not:N \s__keys_stop
   }
-    { \tl_if_empty:nTF {#2} }
+    {
+      \tl_if_empty:nTF {#3}
+        { \use_i:nnn }
+        {
+          \tl_if_empty:nTF {#2}
+            { \use_ii:nnn }
+            { \use_iii:nnn }
+        }
+    }
 \cs_new_protected:Npn \__keys_bool_set:Nn #1#2
   { \__keys_bool_set:Nnnn #1 {#2} { true } { false } }
 \cs_generate_variant:Nn \__keys_bool_set:Nn { c }
@@ -37386,10 +37395,10 @@
   { \text_uppercase:nn {#1} {#2} }
 \__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_titlecase_first:n }
 \cs_new:Npn \tl_mixed_case:n #1
-  { \text_titlecase_first:n {#1} }
+  { \text_titlecase_first:n { \text_lowercase:n {#1} } }
 \__kernel_patch_deprecation:nnNNpn { 2020-01-03 } { \text_titlecase_first:nn }
 \cs_new:Npn \tl_mixed_case:nn #1#2
-  { \text_titlecase_first:nn {#1} {#2} }
+  { \text_titlecase_first:nn {#1} { \text_lowercase:n {#2} } }
 \__kernel_patch_deprecation:nnNNpn { 2022-05-23 } { \token_case_meaning:Nn }
 \cs_new:Npn \tl_case:Nn { \token_case_meaning:Nn }
 \__kernel_patch_deprecation:nnNNpn { 2022-05-23 } { \token_case_meaning:NnT }
diff --git a/texmf/tex/latex/l3kernel/expl3-generic.tex b/texmf/tex/latex/l3kernel/expl3-generic.tex
index 115116eb8..6f417c325 100644
--- a/texmf/tex/latex/l3kernel/expl3-generic.tex
+++ b/texmf/tex/latex/l3kernel/expl3-generic.tex
@@ -19,7 +19,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: expl3.dtx
-\def\ExplFileDate{2024-06-19}%
+\def\ExplFileDate{2024-07-20}%
 \let\ExplLoaderFileDate\ExplFileDate
 \begingroup
   \catcode`\_=11
diff --git a/texmf/tex/latex/l3kernel/expl3.ltx b/texmf/tex/latex/l3kernel/expl3.ltx
index d69c3f785..512497e7a 100644
--- a/texmf/tex/latex/l3kernel/expl3.ltx
+++ b/texmf/tex/latex/l3kernel/expl3.ltx
@@ -19,7 +19,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: expl3.dtx
-\def\ExplFileDate{2024-06-19}%
+\def\ExplFileDate{2024-07-20}%
 \let\ExplLoaderFileDate\ExplFileDate
 \begingroup
   \catcode`\_=11
diff --git a/texmf/tex/latex/l3kernel/expl3.sty b/texmf/tex/latex/l3kernel/expl3.sty
index cf7a71387..10c4ecbc7 100644
--- a/texmf/tex/latex/l3kernel/expl3.sty
+++ b/texmf/tex/latex/l3kernel/expl3.sty
@@ -19,7 +19,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: expl3.dtx
-\def\ExplFileDate{2024-06-19}%
+\def\ExplFileDate{2024-07-20}%
 \let\ExplLoaderFileDate\ExplFileDate
 \ProvidesPackage{expl3}
   [%
diff --git a/texmf/tex/latex/l3kernel/l3debug.def b/texmf/tex/latex/l3kernel/l3debug.def
index 85e836797..000b6dcb4 100644
--- a/texmf/tex/latex/l3kernel/l3debug.def
+++ b/texmf/tex/latex/l3kernel/l3debug.def
@@ -19,7 +19,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: l3debug.dtx
-\ProvidesExplFile{l3debug.def}{2024-06-19}{}{L3 Debugging support}
+\ProvidesExplFile{l3debug.def}{2024-07-20}{}{L3 Debugging support}
 \scan_new:N \s__debug_stop
 \cs_new:Npn \__debug_use_i_delimit_by_s_stop:nw #1 #2 \s__debug_stop {#1}
 \quark_new:N \q__debug_recursion_tail
diff --git a/texmf/tex/latex/l3kernel/l3doc.cls b/texmf/tex/latex/l3kernel/l3doc.cls
index f0c283a38..4d4876f56 100644
--- a/texmf/tex/latex/l3kernel/l3doc.cls
+++ b/texmf/tex/latex/l3kernel/l3doc.cls
@@ -20,7 +20,7 @@
 %% 
 %% File: l3doc.dtx
 \RequirePackage{calc}
-\ProvidesExplClass{l3doc}{2024-06-19}{}
+\ProvidesExplClass{l3doc}{2024-07-20}{}
   {L3 Experimental documentation class}
 \clist_new:N \g_docinput_clist
 \seq_new:N \g_doc_functions_seq