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1. Print stack

   pstack or

   /printStack {
       0 1 count 3 sub {
       dup (  ) cvs =only (: ) =only index dup dup xcheck =only ( ) =only type =only ( ) =only ==
   } for
   
   } def
   
   (hello) 42 [1 2 3] {dup mul} 3.14159
   
   printStack
   

   will print:

   0: false realtype 3.14159
   1: true arraytype {dup mul}
   2: false arraytype [1 2 3]
   3: false integertype 42
   4: false stringtype (hello)