```\nfunction _getSum(uint32[] memory numbers) internal pure returns (uint32 sum) {\n  // overflow should be impossible in for-loop index\n  uint256 numbersLength = numbers.length;\n  for (uint256 i = 0; i < numbersLength; ) {\n    sum += numbers[i];\n    unchecked {\n      // overflow should be impossible in for-loop index\n      ++i;\n    }\n  }\n}\n```\n