function assertLt(uint256 left, uint256 right) internal;function assertLt(uint256 left, uint256 right, string memory err) internal;function assertLt(int256 left, int256 right) internal;function assertLt(int256 left, int256 right, string memory err) internal;Asserts left is strictly less than right.
Optionally includes an error message in the revert string.