[rstuart4133]

It turns out "bar/" is equivalent to "bar/."

That means "bar/" is just a contraction of "bar/."

For some reason I find the presence of the "." makes it much easier to reason about. Probably that because turns it into the same pattern as "rsync foo/x bar/y". Most people know what that does, even if "foo/x" or "foo/y" are directories.