contract UnderscoreNumberLiterals =

  entrypoint ints() : list(int) =
    [ 1_999_000_000,
      19_99_00_00_00,
      0xfff_FFF_010 ]

  entrypoint bytes() : list(bytes(4)) =
    [ #abcd_ef_00,
      #01_02_03_04,
      #aaaa_FFFF ]