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  DB<50> sub tst { "a".."d" }

...
  DB<54> x tst()              # once flip-flop, always flip-flop
0  0
  DB<55>

    
  DB<44> sub tst { reverse "a".."d" }

...
2  'b'
3  'a'
  DB<48>

  DB<55> sub tst { reverse reverse "a".."d" }

  DB<59> sub tst { @{["a".."d"]} }

...
2  'c'
3  'd'
  DB<63>