Why? You can reconstruct it with a simple "ANALYZE" command. Dumping and restoring would mean nailing down cross-version assumptions about what it contains, which doesn't seem real forward-looking...
I seem to recall that people like that kind of thing so that the dump is really the current state of the database.
Also, I believe big db's like DB2 and Oracle do such a thing.
I just recall it being discussed some time ago...
Chris
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