> Hm, you're right, 'thou I wouldn't recommend this to the average user, 
> and wonder if this will be possible for all future pgsql versions too. 
> I'm considering adding safe support for this type of column change to 
> pgAdmin3.
> There might be other cases of legal direct change of system catalog 
> entries, e,g. varchar to text, if they all are only names for internally 
> identical data structures. Can you tell which datatypes may be legally 
> interchanged?

Yes, you can check if they're binary compatible from the pg_cast table....


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