information_schema.role_table_grants differs from relacl

Hello,

there seems to be a difference between information_schema and pg_catalog when it comes to privileges.

pg_class and pgAdmin III show ACL = arwdDxt

pgAdmin III displays this as:
GRANT ALL ON TABLE blabla.tabelle TO benutzer;

However, information_schema.role_table_grants has is_grantable = YES for every privilege_type on this view for the user
inquestion. 

The user is owner of the view and also superuser.

So my question is: is is_grantable not the same as 'WITH GRANT OPTION'?

Could you tell me, please?

Thank you very much,

Peter

P.S. Server version is PostgreSQL 8.4.3 on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 3.3.3 (SuSE Linux),
64-bit
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