possible regression (or me abusing git) in v1.5.5

Hello,

After upgrading to v1.5.5, I noticed a change in the way that git
treats symbolic links.

Git will follow symbolic links to directories when they were added as follows

$ git init
$ mkdir foo
$ touch foo/bar
$ ln -s foo foo1
$ git add foo1/
#               Note the trailing slash above.

In v1.5.5 (but not v1.5.4.5 and earlier),
$ git add -u
will remove foo1/bar from the index.

I have bisected this down to f58dbf (diff-files: careful when
inspecting work tree items).

The ability for git to follow links (instead of recording them) was a
useful feature for me, but I may have been abusing this "feature".  If
that is the consensus, it might make sense to have
$ git add foo1
and
$ git add foo1/
 behave the same way?

Thanks,
Tarmigan