OK, question answered, TODO item added:
* Add non-large-object binary field
> > Is this doable? I just looked at the list of datatypes and didn't see
> > binary as one of them.
>
> bytea ... even if we didn't have one, inventing it would be trivial.
> (Although I wonder whether pg_dump copes with arbitrary data in fields
> properly ... I think there are still some issues about COPY protocol
> not being fully 8-bit-clean...)
>
> As someone else pointed out, you'd still want an equivalent of
> lo_read/lo_write, but now it would mean fetch or put N bytes at an
> offset of M bytes within the value of field X of tuple Y in some
> relation. Otherwise field X is pretty much like any other item in the
> database. I suppose it'd only make sense to allow random data to be
> fetched/stored in a bytea field --- other datatypes would want to
> constrain the data to valid values...
>
> regards, tom lane
>
>
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