add table OID (or something else) to the information schema
Peter may have been alluding to this, and I misunderstood, but one idea might be to present a mangled name in the information schema; since the spec expects them to be unique, perhaps the schema should present them as unique. Downside is that named constraints would also have to be mangled. A compromise would be to only mangle the '$n' constraints, and just prepend 'pg_<tablename>' to the constraint name in the view.
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