committed to the repository with `git commit` or similar commands
  is hardened.
* `added` is an aggregate option that is currently equivalent to
  `committed,index`. This mode sacrifices additional performance to
  ensure that the results of commands like `git add` and similar operations
  are hardened.
* `all` is an aggregate option that syncs all individual components above.

core.fsyncMethod::
	A value indicating the strategy Git will use to harden repository data
	using fsync and related primitives.
+
* `fsync` uses the fsync() system call or platform equivalents.
* `writeout-only` issues pagecache writeback requests, but depending on the
  filesystem and storage hardware, data added to the repository may not be
  durable in the event of a system crash. This is the default mode on macOS.
* `batch` enables a mode that uses writeout-only flushes to stage multiple
  updates in the disk writeback cache and then does a single full fsync of
  a dummy file to trigger the disk cache flush at the end of the operation.
+
Currently `batch` mode only applies to loose-object files. Other repository
data is made durable as if `fsync` was specified. This mode is expected to
be as safe as `fsync` on macOS for repos stored on HFS+ or APFS filesystems
and on Windows for repos stored on NTFS or ReFS filesystems.

core.fsyncObjectFiles::
	This boolean will enable 'fsync()' when writing object files.
	This setting is deprecated. Use core.fsync instead.
+
This setting affects data added to the Git repository in loose-object
form. When set to true, Git will issue an fsync or similar system call
to flush caches so that loose-objects remain consistent in the face
of a unclean system shutdown.

core.preloadIndex::
	Enable parallel index preload for operations like 'git diff'
+
This can speed up operations like 'git diff' and 'git status' especially
on filesystems like NFS that have weak caching semantics and thus
relatively high IO latencies.  When enabled, Git will do the
index comparison to the filesystem data in parallel, allowing
overlapping IO's.  Defaults to true.

core.unsetenvvars::
	Windows-only: comma-separated list of environment variables'
	names that need to be unset before spawning any other process.
	Defaults to `PERL5LIB` to account for the fact that Git for
	Windows insists on using its own Perl interpreter.

core.restrictinheritedhandles::
	Windows-only: override whether spawned processes inherit only standard
	file handles (`stdin`, `stdout` and `stderr`) or all handles. Can be
	`auto`, `true` or `false`. Defaults to `auto`, which means `true` on
	Windows 7 and later, and `false`