timestamp('01/12/01') doesn't work in 7.2 beta4

Hello,
	The timestamp('25/12/01') would return a timestamp in 7.1, how ever
in 7.2 beta 4 select "timestamp"('25/12/01') is needed, although select
timestamptz('25/12/01') works. Is this change intentional and if so is there
a way of getting the old functionality to work?
	I have the timestamp('25/12/01') in clients that would be a pain to
upgrade and was hoping to go to 7.2 seamlessly (and yes I do feel a dufous
for not using spec approved CAST('25/12/01' AS timestamp) :) )
- Stuart
P.S. Please reply to me as well as list