I think that we can actually get away (from an implementation point of view) with a column containing arrays of different base types; array_out will still work AFAIR. It's an interesting question though how such a column could reasonably be declared. This ties into your recent investigations into polymorphic array functions, perhaps.
Maybe "anyarray" shouldn't be quite so pseudo a pseudotype?
I was having similar thoughts when you first posted this, but I wasn't sure you'd want to go there. I wonder what changes are required other than promoting the typtype from a 'p' to a 'b' and the I/O functions to array_out/array_in?
Joe
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