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[alms@cambridge.apple.com (Andrew LM Shalit)]

>   ...If you have separate classes for true & false then its possible
>   to define the basic control structures using polymorphism on #t &
>   #f and lambda (method)....

While this is a simplification in theory, I don't think it would simplify
the practice of programming in Dylan.  It might be different in Self and
Smalltalk.

If you allow the user to define methods on IF, then it also makes things
much harder for the compiler.

   -Andrew