Can't setval() a sequence to return the first value

Hi hackers.

Is it by design that you can't setval(seq, value) a sequence to a value
which returns the first value:

See the sample below for better explanation:

hannu=# create sequence s;
CREATE SEQUENCE
hannu=# select nextval('s');
nextval
---------
1
(1 row)
hannu=# select setval('s',1);
setval
--------
1
(1 row)
hannu=# select nextval('s');
nextval
---------
2
(1 row)
hannu=# select setval('s',0);
ERROR: setval: value 0 is out of bounds for sequence "s"
(1..9223372036854775807)

Should it not be possible to set sequence to one below the start value
so that you can completely reset it ?

--------------------
Hannu