I didn't write that (or at least, I didn't mean to write that :-). The SQL standard tells that they will not use trailing underscores, therefore *my* conclusion is that it is future proof (from a standards perspective) if all PostgreSQL extensions use a trailing underscore. Which also gives an indication to the user that it is a PostgreSQL extension.
All you need to do is add an oid_ column then you can join the info_schema tables to the catalogs however you like.
Chris
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