While the ref name encoding is unspecified, UTF-8 is preferred as
some output processing may assume ref names in UTF-8.
+'@'::
+ '@' alone is a shortcut for 'HEAD'.
+
'<refname>@\{<date>\}', e.g. 'master@\{yesterday\}', 'HEAD@\{5 minutes ago\}'::
A ref followed by the suffix '@' with a date specification
enclosed in a brace
object that exists, without requiring 'rev' to be a tag, and
without dereferencing 'rev'; because a tag is already an object,
it does not have to be dereferenced even once to get to an object.
++
+'rev{caret}\{tag\}' can be used to ensure that 'rev' identifies an
+existing tag object.
'<rev>{caret}\{\}', e.g. 'v0.99.8{caret}\{\}'::
A suffix '{caret}' followed by an empty brace pair