bug in 8.3? foreign key refers to different type

These create table commands succeed, even tho the foreign key refers to a 'different' type (int2 product_id column refers to an int8 column):

CREATE TABLE products (
id int8 primary key,
name text not null
);

CREATE TABLE orders (
id int8 PRIMARY KEY,
product_id int2 not null REFERENCES products (id)
);

If I replace int2 with numeric, real, text, etc it fails as expected ("key columns are of incompatible types").

Expected: integer types should match exactly (or at least be large enough to hold the referenced value).

thanks,
--craig

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