nextval result type difference between 7.1.3 and 7.2.1

[Somehow my emails bounced back, I'm doing this using telnet with SMTP port!]
Hello,

I use PostgreSQL, UnixODBC, and Lisp configuration.

I call 'nextval' to get an ID on Lisp like:

(query "select nextval('UNIQUE_ID_SEQUENCE')")

With PostgreSQL 7.1.3 and UnixODBC 2.0.7 or 2.2.3 it returns an
integer(ex, 123), but with PostgreSQL 7.2.1, it returns a string(ex,
"123").

Any idea how to fix the problem?

Cheers,

- Jong-won Choi