BUG #1307: Possible bug inheritance/referential integrity

The following bug has been logged online:

Bug reference: 1307
Logged by: Thomas Jacob

Email address: jacob(at)internet24(dot)de

PostgreSQL version: 7.4.5

Operating system: Gentoo Linux, Kernel 2.6.7

Description: Possible bug inheritance/referential integrity

Details:

Rows inserted into a table "sub" inherited from a table
"super" do not seem to exist in the super-table from the point of
view of the foreign key constraint checker in references to the
"super"-table, even though a SELECT query displays the rows that
were inserted into sub also in super, as should be (See example
provided).

But they should exist, shouldn't they? Or do I simply not
understand PostgreSQL's inheritance model correctly?

CREATE TABLE super (id INT PRIMARY KEY);
CREATE TABLE super_ref (id INT REFERENCES super);
CREATE TABLE sub () INHERITS(super);

-- this works
INSERT INTO super VALUES(1); INSERT INTO super_ref VALUES(1);

-- clean up
DELETE FROM super_ref; DELETE FROM super;

-- this fails with: ERROR: insert or update on table "super_ref" violates
foreign key constraint "$1"
INSERT INTO sub VALUES(1); INSERT INTO super_ref VALUES(1);