[z-machine] Different 1.1 proposal: put_prop and get_prop

[David Kinder]

From: "Ben A L Jemmett"
> None that I know of for put_prop (Zinc will halt on such an operation);
> get_prop is called in this manner by Christminster though.

Ack. That'll teach me to make statements about whether anyone calls an opcode
in a certain way ... I don't think it would be a good idea to change the spec
in a way that would break existing games.

How about @get_prop returning the size of the property for extended properties,
and @put_prop being a no-op for extended, possibly also printing a diagnostic
message?

From: "Cedric Knight"
> I'm new to this kind of discussion.  If there are no story files
> trying to do it, how do we know what the Infocom behaviour would be in
> the situation?  By reverse engineering the Infocom interpreters?

People have reverse engineered at least parts of several Infocom interpreters.
You could always just compile a z-code file with Inform and run it with one
of Infocom's DOS interpreters, as well.

David