extensions.*::
	Unless otherwise stated, is an error to specify an extension if
	`core.repositoryFormatVersion` is not `1`. See
	linkgit:gitrepository-layout[5].
+
--
compatObjectFormat::
	Specify a compatibility hash algorithm to use.  The acceptable values
	are `sha1` and `sha256`.  The value specified must be different from the
	value of `extensions.objectFormat`.  This allows client level
	interoperability between git repositories whose objectFormat matches
	this compatObjectFormat.  In particular when fully implemented the
	pushes and pulls from a repository in whose objectFormat matches
	compatObjectFormat.  As well as being able to use oids encoded in
	compatObjectFormat in addition to oids encoded with objectFormat to
	locally specify objects.

noop::
	This extension does not change git's behavior at all. It is useful only
	for testing format-1 compatibility.
+
For historical reasons, this extension is respected regardless of the
`core.repositoryFormatVersion` setting.

noop-v1::
	This extension does not change git's behavior at all. It is useful only
	for testing format-1 compatibility.

objectFormat::
	Specify the hash algorithm to use.  The acceptable values are `sha1` and
	`sha256`.  If not specified, `sha1` is assumed.
+
Note that this setting should only be set by linkgit:git-init[1] or
linkgit:git-clone[1].  Trying to change it after initialization will not
work and will produce hard-to-diagnose issues.

partialClone::
	When enabled, indicates that the repo was created with a partial clone
	(or later performed a partial fetch) and that the remote may have
	omitted sending certain unwanted objects.  Such a remote is called a
	"promisor remote" and it promises that all such omitted objects can
	be fetched from it in the future.
+
The value of this key is the name of the promisor remote.
+
For historical reasons, this extension is respected regardless of the
`core.repositoryFormatVersion` setting.

preciousObjects::
	If enabled, indicates that objects in the repository MUST NOT be deleted
	(e.g., by `git-prune` or `git repack -d`).
+
For historical