Wire protocol: type-specific opt-in to binary format

I would like to add functionality which allows a client to tell the
server which types can be sent in binary format.  The immediate goal is
to suppress hex quoting for BYTEA values, but it seems to make sense to
make this functionality more general.

This doesn't have to be a flag on the wire protocol, it could be a
regular run-time parameter.

Do you think this would make sense?

--
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
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