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1. def and bind def

   bind def: add lookup occurs once at definition:

   save
   /foo { add } bind def
   1 2 foo ==            % 3
   /add { mul } def
   1 2 foo ==            % 3, uses original add
   restore
   

   def alone: add lookup occurs each time:

   save
   /foo { add } def
   1 2 foo ==            % 3
   /add { mul } def
   1 2 foo ==            % 2, uses redefined add
   restore