integer(1). How far back to go from current HEAD.
Same as the command line git log -n parameter.
For git stash commands, zero-index into the stash list.
file
character(1). The path to a file.
branch
character(1). The name of a branch, typically a
feature branch.
sha
character(n). The commit secure hash algorithm (SHA-1).
If NULL, typically points to the most recent commit on
the current branch.