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+Git 2.21 Release Notes
+Backward Compatibility Notes
+Updates since v2.20
+UI, Workflows & Features
+ * The "http.version" configuration variable can be used with recent
+ enough cURL library to force the version of HTTP used to talk when
+ fetching and pushing.
+ * Small fixes and features for fast-export and fast-import, mostly on
+ the fast-export side.
+ * "git push $there $src:$dst" rejects when $dst is not a fully
+ qualified refname and not clear what the end user meant. The
+ codepath has been taught to give a clearer error message, and also
+ guess where the push should go by taking the type of the pushed
+ object into account (e.g. a tag object would want to go under
+ refs/tags/).
+ * "git checkout [<tree-ish>] path..." learned to report the number of
+ paths that have been checked out of the index or the tree-ish,
+ which gives it the same degree of noisy-ness as the case in which
+ the command checks out a branch.
+ * "git quiltimport" learned "--keep-non-patch" option.
+ * "git worktree remove" and "git worktree move" refused to work when
+ there is a submodule involved. This has been loosened to ignore
+ uninitialized submodules.
+ * "git cherry-pick -m1" was forbidden when picking a non-merge
+ commit, even though there _is_ parent number 1 for such a commit.
+ This was done to avoid mistakes back when "cherry-pick" was about
+ picking a single commit, but is no longer useful with "cherry-pick"
+ that can pick a range of commits. Now the "-m$num" option is
+ allowed when picking any commit, as long as $num names an existing
+ parent of the commit.
+ * Update "git multimail" from the upstream.
+ * "git p4" update.
+ * The "--format=<placeholder>" option of for-each-ref, branch and tag
+ learned to show a few more traits of objects that can be learned by
+ the object_info API.
+ * "git rebase -i" learned to re-execute a command given with 'exec'
+ to run after it failed the last time.
+ * "git diff --color-moved-ws" updates.
+ * Custom userformat "log --format" learned %S atom that stands for
+ the tip the traversal reached the commit from, i.e. --source.
+Performance, Internal Implementation, Development Support etc.
+ * Code clean-up with optimization for the codepath that checks
+ (non-)existence of loose objects.
+ * More codepaths become aware of working with in-core repository
+ instance other than the default "the_repository".
+ * The "strncat()" function is now among the banned functions.
+ * Portability updates for the HPE NonStop platform.
+ * Earlier we added "-Wformat-security" to developer builds, assuming
+ that "-Wall" (which includes "-Wformat" which in turn is required
+ to use "-Wformat-security") is always in effect. This is not true
+ when config.mak.autogen is in use, unfortunately. This has been
+ fixed by unconditionally adding "-Wall" to developer builds.
+ * The loose object cache used to optimize existence look-up has been
+ updated.
+ * Flaky tests can now be repeatedly run under load with the
+ "--stress" option.
+ (merge fb7d1e3ac8 sg/stress-test later to maint).
+ * Documentation/Makefile is getting prepared for manpage
+ localization.
+ * "git fetch-pack" now can talk the version 2 protocol.
+ * sha-256 hash has been added and plumbed through the code to allow
+ building Git with the "NewHash".
+ * Debugging help for http transport.
+ * "git fetch --deepen=<more>" has been corrected to work over v2
+ protocol.
+ * The code to walk tree objects has been taught that we may be
+ working with object names that are not computed with SHA-1.
+Fixes since v2.20
+ * Updates for corner cases in merge-recursive.
+ (merge cc4cb0902c en/merge-path-collision later to maint).
+ * "git checkout frotz" (without any double-dash) avoids ambiguity by
+ making sure 'frotz' cannot be interpreted as a revision and as a
+ path at the same time. This safety has been updated to check also
+ a unique remote-tracking branch 'frotz' in a remote, when dwimming
+ to create a local branch 'frotz' out of a remote-tracking branch
+ 'frotz' from a remote.
+ (merge be4908f103 nd/checkout-dwim-fix later to maint).
+ * Refspecs configured with "git -c var=val clone" did not propagate
+ to the resulting repository, which has been corrected.
+ (merge 7eae4a3ac4 sg/clone-initial-fetch-configuration later to maint).
+ * A properly configured username/email is required under
+ user.useConfigOnly in order to create commits; now "git stash"
+ (even though it creates commit objects to represent stash entries)
+ command is exempt from the requirement.
+ (merge 3bc2111fc2 sd/stash-wo-user-name later to maint).
+ * The http-backend CGI process did not correctly clean up the child
+ processes it spawns to run upload-pack etc. when it dies itself,
+ which has been corrected.
+ (merge 02818a98d7 mk/http-backend-kill-children-before-exit later to maint).
+ * "git rev-list --exclude-promisor-objects" had to take an object
+ that does not exist locally (and is lazily available) from the
+ command line without barfing, but the code dereferenced NULL.
+ (merge 4cf67869b2 md/list-lazy-objects-fix later to maint).
+ * The traversal over tree objects has learned to honor
+ ":(attr:label)" pathspec match, which has been implemented only for
+ enumerating paths on the filesystem.
+ (merge 5a0b97b34c nd/attr-pathspec-in-tree-walk later to maint).
+ * BSD port updates.
+ (merge 4e3ecbd439 cb/openbsd-allows-reading-directory later to maint).
+ (merge b6bdc2a0f5 cb/t5004-empty-tar-archive-fix later to maint).
+ (merge 82cbc8cde2 cb/test-lint-cp-a later to maint).
+ * Lines that begin with a certain keyword that come over the wire, as
+ well as lines that consist only of one of these keywords, ought to
+ be painted in color for easier eyeballing, but the latter was
+ broken ever since the feature was introduced in 2.19, which has
+ been corrected.
+ (merge 1f67290450 hn/highlight-sideband-keywords later to maint).
+ * "git log -G<regex>" looked for a hunk in the "git log -p" patch
+ output that contained a string that matches the given pattern.
+ Optimize this code to ignore binary files, which by default will
+ not show any hunk that would match any pattern (unless textconv or
+ the --text option is in effect, that is).
+ (merge e0e7cb8080 tb/log-G-binary later to maint).
+ * "git submodule update" ought to use a single job unless asked, but
+ by mistake used multiple jobs, which has been fixed.
+ (merge e3a9d1aca9 sb/submodule-fetchjobs-default-to-one later to maint).
+ * "git stripspace" should be usable outside a git repository, but
+ under the "-s" or "-c" mode, it didn't.
+ (merge 957da75802 jn/stripspace-wo-repository later to maint).
+ * Some of the documentation pages formatted incorrectly with
+ Asciidoctor, which have been fixed.
+ (merge b62eb1d2f4 ma/asciidoctor later to maint).
+ * The core.worktree setting in a submodule repository should not be
+ pointing at a directory when the submodule loses its working tree
+ (e.g. getting deinit'ed), but the code did not properly maintain
+ this invariant.
+ * With zsh, "git cmd path<TAB>" was completed to "git cmd path name"
+ when the completed path has a special character like SP in it,
+ without any attempt to keep "path name" a single filename. This
+ has been fixed to complete it to "git cmd path\ name" just like
+ Bash completion does.
+ * The test suite tried to see if it is run under bash, but the check
+ itself failed under some other implementations of shell (notably
+ under NetBSD). This has been corrected.
+ (merge 54ea72f09c sg/test-bash-version-fix later to maint).
+ * "git gc" and "git repack" did not close the open packfiles that
+ they found unneeded before removing them, which didn't work on a
+ platform incapable of removing an open file. This has been
+ corrected.
+ (merge 5bdece0d70 js/gc-repack-close-before-remove later to maint).
+ * The code to drive GIT_EXTERNAL_DIFF command relied on the string
+ returned from getenv() to be non-volatile, which is not true, that
+ has been corrected.
+ (merge 6776a84dae kg/external-diff-save-env later to maint).
+ * There were many places the code relied on the string returned from
+ getenv() to be non-volatile, which is not true, that have been
+ corrected.
+ (merge 0da0e9268b jk/save-getenv-result later to maint).
+ * The v2 upload-pack protocol implementation failed to honor
+ hidden-ref configuration, which has been corrected.
+ (merge e20b4192a3 jk/proto-v2-hidden-refs-fix later to maint).
+ * "git fetch --recurse-submodules" may not fetch the necessary commit
+ that is bound to the superproject, which is getting corrected.
+ (merge be76c21282 sb/submodule-recursive-fetch-gets-the-tip later to maint).
+ * "git rebase" internally runs "checkout" to switch between branches,
+ and the command used to call the post-checkout hook, but the
+ reimplementation stopped doing so, which is getting fixed.
+ * "git add -e" got confused when the change it wants to let the user
+ edit is smaller than the previous change that was left over in a
+ temporary file.
+ (merge fa6f225e01 js/add-e-clear-patch-before-stating later to maint).
+ * Code cleanup, docfix, build fix, etc.
+ (merge 89ba9a79ae hb/t0061-dot-in-path-fix later to maint).
+ (merge d173e799ea sb/diff-color-moved-config-option-fixup later to maint).
+ (merge a8f5a59067 en/directory-renames-nothanks-doc-update later to maint).
+ (merge ec36c42a63 nd/indentation-fix later to maint).
+ (merge f116ee21cd do/gitweb-strict-export-conf-doc later to maint).
+ (merge 112ea42663 fd/gitweb-snapshot-conf-doc-fix later to maint).
+ (merge 1cadad6f65 tb/use-common-win32-pathfuncs-on-cygwin later to maint).
+ (merge 57e9dcaa65 km/rebase-doc-typofix later to maint).
+ (merge b8b4cb27e6 ds/gc-doc-typofix later to maint).
+ (merge 3b3357626e nd/style-opening-brace later to maint).
+ (merge b4583d5595 es/doc-worktree-guessremote-config later to maint).
+ (merge cce99cd8c6 ds/commit-graph-assert-missing-parents later to maint).
+ (merge 0650614982 cy/completion-typofix later to maint).
+ (merge 6881925ef5 rs/sha1-file-close-mapped-file-on-error later to maint).
+ (merge bd8d6f0def en/show-ref-doc-fix later to maint).
+ (merge 1747125e2c cc/parial-clone-doc-typofix later to maint).
+ (merge e01378753d cc/fetch-error-message-fix later to maint).
+ (merge 54e8c11215 jk/remote-insteadof-cleanup later to maint).