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Date:Mon Apr 13 17:35:52 2000 
Subject:Types 
From:pop 
Volume-ID:1000413.02 

So far nobody's mentioned lib objectclass. That does run-time
type checking during method invocation. I use it a lot.
The multiple-dispatch of methods is distinctly handy as
compared with single dispatch of Java.  The extant classes
are a not-exactly-seamless mechanism for importing standard
POP types into the object hierarchy (but about as good as
one could do). We might be advised by its creator whether
some compile-time type-checking could be done.

Robin.