message: change frac from auto to uint16_t just for clarity.
diff: @@ -184,7 +184,7 @@ arith_uint256 CalculateASERT(const arith_uint256 &refTarget,
  // First decompose exponent into 'integer' and 'fractional' parts:
  int64_t shifts = exponent >> 16;
  - const auto frac = uint16_t(exponent);
  + const uint16_t frac = uint16_t(exponent);
  assert(exponent == (shifts * 65536) + frac);
  // multiply target by 65536 * 2^(fractional part)
  