* "git clone" learned to make a shallow clone for a single commit
that is not necessarily be at the tip of any branch.
+ * Lazy-loading missing files in a blobless clone on demand is costly
+ as it tends to be one-blob-at-a-time. "git backfill" is introduced
+ to help bulk-download necessary files beforehand.
+
+ * "git push --atomic --porcelain" used to ignore failures from the
+ other side, losing the error status from the child process, which
+ has been corrected.
+
+ * "git rev-list --missing=" learned to accept "print-info" that gives
+ known details expected of the missing objects, like path and type.
+
Performance, Internal Implementation, Development Support etc.
--------------------------------------------------------------
* All the documentation .txt files have been renamed to .adoc to help
content aware editors.
+ * "git difftool" code clean-up.
+
Fixes since v2.48
-----------------
has been corrected.
(merge 93dc16483a bf/fetch-set-head-fix later to maint).
+ * A thunderbird helper script lost its bashism.
+ (merge 59d26bd961 bc/contrib-thunderbird-patch-inline-fix later to maint).
+
* Other code cleanup, docfix, build fix, etc.
(merge ddb5287894 jk/t7407-use-test-grep later to maint).
(merge 21e1b44865 aj/difftool-config-doc-fix later to maint).
(merge 8705c9bd13 kn/pack-write-with-reduced-globals later to maint).
(merge 087740d65a ps/leakfixes-0129 later to maint).
(merge 6bba6f604b jp/doc-trailer-config later to maint).
+ (merge f1cc562b77 lo/t7603-path-is-file-update later to maint).