On Thu, Nov 7, 2013 at 12:57 AM, Junio C Hamano [off-list ref] wrote:

 * "git replace" helper no longer allows an object to be replaced with
   another object of a different type to avoid confusion (you can
   still manually craft such replacement using "git update-ref", as an
   escape hatch).

Maybe it would be more helpful to say "you can still do that using the
--force option" instead of pointing people to "git update-ref".

Thanks,
Christian.