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  DB<8> x ["a",=>"b"]
0  ARRAY(0x54e32f0)
...
0  ARRAY(0x54e2cd8)
   0  'a'
   1  'b'

  DB<12> x map {lc,$_} "A".."C"
0  'a'
...
3  'B'
4  'c'
5  'C'