* Handling of an empty subdirectory of .git/refs/ in the ref-files
backend has been corrected.
+ * Our CI script requires "sudo" that can be told to preserve
+ environment, but Ubuntu replaced with "sudo" with an implementation
+ that lacks the feature. Work this around by reinstalling the
+ original version.
+ (merge fddb484255 ps/ci-avoid-broken-sudo-on-ubuntu later to maint).
+
+ * The reftable backend learned to sanity check its on-disk data more
+ carefully.
+ (merge 466a3a1afd kn/reftable-consistency-checks later to maint).
+
* Other code cleanup, docfix, build fix, etc.
(merge 823d537fa7 kh/doc-git-log-markup-fix later to maint).
(merge cf7efa4f33 rj/t6137-cygwin-fix later to maint).
(merge e1d062e8ba ps/odb-clean-stale-wrappers later to maint).
(merge fdd21ba116 mh/doc-credential-url-prefix later to maint).
(merge 1c573a3451 en/doc-merge-tree-describe-merge-base later to maint).
+ (merge 84a6bf7965 ja/doc-markup-attached-paragraph-fix later to maint).