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function concat(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bytes memory);
function concatStorage(bytes storage _preBytes, bytes memory _postBytes) internal;
function slice(bytes memory _bytes, uint256 _start, uint256 _length) internal pure returns (bytes memory);
function toAddress(bytes memory _bytes, uint256 _start) internal pure returns (address);
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 toUint96(bytes memory _bytes, uint256 _start) internal pure returns (uint96);
function toUint128(bytes memory _bytes, uint256 _start) internal pure returns (uint128);
function toUint256(bytes memory _bytes, uint256 _start) internal pure returns (uint256);
function toBytes32(bytes memory _bytes, uint256 _start) internal pure returns (bytes32);
function equal(bytes memory _preBytes, bytes memory _postBytes) internal pure returns (bool);
function equalStorage(bytes storage _preBytes, bytes memory _postBytes) internal view returns (bool);