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currval and DISCARD ALL

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Hi,
is there a way to clear the session state of sequence values fetched by currval(regclass)? "DISCARD ALL" doesn't seem to do it.

eg. (w/ pg 9.2.4)
test=# CREATE SEQUENCE foo_seq;
CREATE SEQUENCE
test=# SELECT nextval('foo_seq');
-[ RECORD 1 ]
nextval | 1

test=# SELECT currval('foo_seq');
-[ RECORD 1 ]
currval | 1

test=# DISCARD ALL;
DISCARD ALL
test=# SELECT currval('foo_seq');
-[ RECORD 1 ]
currval | 1


I'm trying to migrate a large web app to work with pgbouncer's transaction pool mode and it would be easier to identify issues if currval() would return the usual "ERROR: currval of sequence "foo_seq" is not yet defined in this session" if nextval() wasn't called in the same pgbouncer session instead of getting old numbers from past transactions.


thanks,
-nigel.


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