DB<105>  map [ unpack 'C*', $_] ,unpack '(a10)*', '12345678901234567890'
 => (
  [49, 50, 51, 52, 53, 54, 55, 56, 57, 48],
  [49, 50, 51, 52, 53, 54, 55, 56, 57, 48],
)