smallint out of range EXECUTEing prepared statement

Is this expected behavior ?

ts=# SELECT * FROM t WHERE site_id=32768 LIMIT 1;
(0 rows)

ts=# PREPARE x AS SELECT * FROM t WHERE site_id=$1 LIMIT 1;
PREPARE
ts=# EXECUTE x(32768);
ERROR: smallint out of range

ts=# PREPARE y AS SELECT * FROM t WHERE site_id::int=$1 LIMIT 1;
PREPARE
ts=# EXECUTE y(32768);
(0 rows)

Note, we also sometimes get small/int out of range when SELECTing from a view,
and we end up as a workaround putting a ::big/int cast into the view or
multiplying by 1.

Thanks,
Justin