'git merge tag' not working as before

Hi,

I used to do things like 'git merge v1.7.10.3' (from v1.7.10.2) but
even though it's ff it tries to create a merge commit.

Seems like now I have to run 'git merge v1.7.10.3^0', I don't see why
that would be desirable.

I think this is a bug and a regression.

Cheers.

-- 
Felipe Contreras