ALTER TABLE can NOT use set (OIDS=true)

Hi,
I create a table, and then i want to add oid column, but only can use "set with oids", not use "set (oids = true)"
while create table support both. Is this a problem?

Here is is my testcase, thank you.
postgres=# create table x(a int) with(oids = false);
CREATE TABLE
postgres=# alter table x set(fillfactor = 90);
ALTER TABLE
postgres=# alter table x set (oids = true);
ERROR: unrecognized parameter "oids"
postgres=#
postgres=# alter table x set with oids;
ALTER TABLE
postgres=#