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function pack(Descriptor memory d) internal pure returns (DescriptorPacked);
function unpack(DescriptorPacked packed) internal pure returns (Descriptor memory d);
function traits(DescriptorPacked packed) internal pure returns (uint32);
function rev(DescriptorPacked packed) internal pure returns (uint32);
function kindRev(DescriptorPacked packed) internal pure returns (uint32);
function setRev(DescriptorPacked packed) internal pure returns (uint32);
function kindId(DescriptorPacked packed) internal pure returns (uint64);
function setId(DescriptorPacked packed) internal pure returns (uint64);