Fix implementation of deprecated \tl_mixed_case:n(n)

They were based on \text_titlecase:n(n) respectively, thus both need a to-lowercase change before title-casing.
muzimuzhi · Jul 19, 2024 · 6ad5e78 · 6ad5e78
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diff --git a/l3kernel/CHANGELOG.md b/l3kernel/CHANGELOG.md
@@ -7,6 +7,9 @@ this project uses date-based 'snapshot' version identifiers.
 
 ## [Unreleased]
 
+### Fixed
+- Implementation of deprecated `\tl_mixed_case:n(n)`
+
 ## [2024-06-19]
 
 ### Fixed

diff --git a/l3kernel/l3deprecation.dtx b/l3kernel/l3deprecation.dtx
@@ -505,10 +505,10 @@
   { \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} } }
 %    \end{macrocode}
 % \end{macro}
 %