Flavor suggestion

[Gregor J. Kiczales <GREGOR at MIT-AI>]

I also like Henry's idea of being able to provide an
:UNCLAIMED-MESSAGE method for flavors.

Maybe the cleanest way to do this is to have an :UNCLAIMED-MESSAGE
method defined on SI:VANILLA-FLAVOR which implements a functionality
like the current SI:UNCLAIMED-MESSAGE. Whenever an instance gets sent
a message it does not handle it would automatically be sent a message
like (:UNCLAIMED-MESSAGE message &rest args)

Then someone who would like to have a flavor which handles unclaimed
messages differently only needs to define their own
:UNCLAIMED-MESSAGE method on that flavor. Their message can implement
whatever unclaimed message functionality they would like.