[Breaking changes] For 6.0

[Amxx]

• Enumerable{Set,Map}
  • Flatten structure using procedural generation (avoid using inner structures and casting)
  • Add support for non value type in code generation (ref)

PLEASE: DO NO START WORKING ON THIS !

[gonzaotc]

• Reorganize the /utils, /cryptography, and /types folders now that they have grown significantly.

[Amxx]

https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5711#issuecomment-2938293803

I'd like to merge the Token > Common into just Token

[Amxx]

• Add an utils/encoding folder
  • Hex (extract toHexString and parseXxx from Strings.sol)
  • Base58
  • Base64
• Add a meta library utils/Encoding.sol that includes all the functions from the encoding libraries

import { Hex } from "./encoding/Hex.sol";
import { Base58 } from "./encoding/Base58.sol";
import { Base64 } from "./encoding/Base64.sol";

library Encoding {
    function base58encode(bytes memory input) internal pure returns (string memory) {
        return Base58.encode(input);
    }

    function base58decode(string memory input) internal pure returns (bytes memory) {
        return Base58.decode(input);
    }

    function base64encode(string memory input) internal pure returns (bytes memory) {
        return Base64.encode(input);
    }

    function hexEncode(bytes memory input) internal pure returns (string memory) {
        return Hex.encode(input);
    }

    function hexEncodeAddr(address input) internal pure returns (string memory) {
        return Hex.encodeChecksumed(input);
    }

    function hexDecodeAddr(string memory input) internal pure returns (address) {
        return Hex.decodeAddress(input);
    }
}

[arr00]

Maybe address the risk of quantum computing for the internal storage structure.

[james-toussaint]

• Add imports-order rule to solhint config.

[Amxx]

• Move ReentrancyGuardTransient's logic to ReentrancyGuard, and drop the non-transient version.
• Mark ReentrancyGuard as stateless to avoid transpilation.
• ~Do not transpile Initializable.sol~ (done in 5.5)
• Remove Context.sol and ERC2771Forwarder.sol
  • Add utils library to get msgSender is ERC-2771 cases (usefull for ERC-7579)
  • Removing Context from Multicall will make it stateless, removing the need for an Upgradeable version of Multicall.

[Amxx]

• ~Do not transpile UUPSUpgradeable, ERC721Holder, ERC1155Holder~ (done in 5.5)
  • other stateless contracts?