I don't think we have ever changed oids for existing data types, so you should be OK.
Are you sure? If we remove a type, then its oid becomes up for grabs by the unused_oids script.
We have removed a few functions in 7.4 (oidsrand, etc.) and I wouldn't be surprised if we haven't _already_ reused those oids...
I think the core should mandate it as policy never to reuse oids and perhaps make the unused_oids script "remember" what has been used...
Chris
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