Also the reason I thought we should have the -implementation
flag is because I thought the way we would document and
define the contract for a callback would be simply:
ad_proc -callback module::op {
{-option {} }
arg1:required
} {
docs
} -
That - at the end is ad_procian for {just docs no body}.
I was also thinking that we could even drop the
arg definition for things that are
ad_proc -callback module::op -implementation X
and use the generated arg parser from the callback definition
rather than having to repeat it again.
