I wouldn't try this without running it against a test database copy first. I've already discovered that a backend change to a column data type like your describing can disrupt indexes, views, and analyze rows based on the table -- the last time I did such, I ended up having to dump and reload the database to get everything responding reliably.
Yeah, I just remembered table types and pg_depend entries, so I'm not really keen to do it any more :/
Chris
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