Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> Could we change the data types of the pg_cast table to regprocedure and
> regtype instead?
Back when we first introduced the reg-foo types, there was some
discussion of changing all relevant catalog columns to those types,
but the idea crashed and burned for reasons I don't recall right
at the moment.
regards, tom lane