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Instance variables

 I also strongly favor the proposal that instance variables of
self be accessed as variables.  I like it because they look
like variables, so you can know there is no funny business
going on when you get or set one.

 Active values ought to be implemented as message protocols rather
than as instance variables with hidden behavior.

 :PRIVATE-INSTANCE-VARIABLES ought to be available, and maybe
should be the default for instance variables unless they are
:GETTABLE or :SETTABLE.
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