// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

// interfaces

// libraries

// contracts

library ERC5643Storage {
    // keccak256(abi.encode(uint256(keccak256("diamond.facets.token.ERC5643.storage")) - 1)) &
    // ~bytes32(uint256(0xff))
    bytes32 internal constant STORAGE_SLOT =
        0x4775a23600034fdd9f073b224f794d51a58b35ba663a9602623ba7a5c09cce00;

    struct Layout {
        mapping(uint256 => uint64) expiration;
    }

    function layout() internal pure returns (Layout storage l) {
        bytes32 slot = STORAGE_SLOT;
        assembly {
            l.slot := slot
        }
    }
}