Any comment on these?

> - How are error situations handled? If my reading is correct, the
> user-supplied read! and write! procedures should return zero
> (bytes/characters read/written) on error. Presumably they can also raise
> an exception if they want to.
>
> - What about object ports (i.e. ports where the fundamental unit or
> reading/writing is an arbitrary Scheme object, not a character or a
> byte) - too complex for this SRFI?