sequences vs. transactions

Hi!
I found a bug, with $SUBJ - i mean ... so look at this:
t=> begin;
BEGIN
t=> select nextval('some_seq');
nextval
-------     4
(1 row)
t=> rollback;
ROLLBACK
t=> select nextval('some_seq');
nextval
-------     5 <<<< five! and NOT 4 again, but 4 expected i think
(1 row)

Or seqences are special case in transations?

-- Neko the Servant of Crash neko@(kornel.szif.hu|kva.hu)   http://lsc.kva.hu