Updating generated-always is false-positive

[avocado-enthusiast]

Describe the bug

Postgres will throw an error if an update tries to change a generated always identity column, pg-mem will not throw. Tests will pass in dev but code will fail once deployed.

To Reproduce

create table test (id integer generated always as identity, value text);
insert into test (value) values ('test');
update test set id=1 where id=1;

ERROR:  column "id" can only be updated to DEFAULT
DETAIL:  Column "id" is an identity column defined as GENERATED ALWAYS.

pg-mem version

version 3.0.4