вспомогательные программы для взаимодействия с удаленными репозиториями (Helper programs to interact with remote repositories)
REF LIST ATTRIBUTES
The list command produces a list of refs in which each ref may be
followed by a list of attributes. The following ref list
attributes are defined.
unchanged
This ref is unchanged since the last import or fetch,
although the helper cannot necessarily determine what value
that produced.
