Git Source
function toUint8(bytes memory _bytes, uint256 _start) internal pure returns (uint8);
function toUint16(bytes memory _bytes, uint256 _start) internal pure returns (uint16);
function toUint32(bytes memory _bytes, uint256 _start) internal pure returns (uint32);
function toUint64(bytes memory _bytes, uint256 _start) internal pure returns (uint64);
function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256);
function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32);
function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory);