remove deprecated and duplicate storage

contracts/governance/compatibility/GovernorCompatibilityBravo.sol

@@ -26,7 +26,6 @@ abstract contract GovernorCompatibilityBravo is IGovernorTimelock, IGovernorComp
     }
 
     struct ProposalDetails {
-        address proposer;
         address[] targets;
         uint256[] values;
         string[] signatures;
@@ -56,7 +55,7 @@ abstract contract GovernorCompatibilityBravo is IGovernorTimelock, IGovernorComp
         string memory description
     ) public virtual override(IGovernor, Governor) returns (uint256) {
         // Stores the proposal details (if not already present) and executes the propose logic from the core.
-        _storeProposal(_msgSender(), targets, values, new string[](calldatas.length), calldatas, description);
+        _storeProposal(targets, values, new string[](calldatas.length), calldatas, description);
         return super.propose(targets, values, calldatas, description);
     }
 
@@ -75,7 +74,7 @@ abstract contract GovernorCompatibilityBravo is IGovernorTimelock, IGovernorComp
         // after the full proposal is stored, so the store operation included in the fallback will be skipped. Here we
         // call `propose` and not `super.propose` to make sure if a child contract override `propose`, whatever code
         // is added there is also executed when calling this alternative interface.
-        _storeProposal(_msgSender(), targets, values, signatures, calldatas, description);
+        _storeProposal(targets, values, signatures, calldatas, description);
         return propose(targets, values, _encodeCalldata(signatures, calldatas), description);
     }
 
@@ -132,7 +131,7 @@ abstract contract GovernorCompatibilityBravo is IGovernorTimelock, IGovernorComp
         bytes32 descriptionHash
     ) public virtual override(IGovernor, Governor) returns (uint256) {
         uint256 proposalId = hashProposal(targets, values, calldatas, descriptionHash);
-        address proposer = _proposalDetails[proposalId].proposer;
+        address proposer = proposalProposer(proposalId);
 
         require(
             _msgSender() == proposer || getVotes(proposer, clock() - 1) < proposalThreshold(),
@@ -182,7 +181,6 @@ abstract contract GovernorCompatibilityBravo is IGovernorTimelock, IGovernorComp
      * @dev Store proposal metadata (if not already present) for later lookup.
      */
     function _storeProposal(
-        address proposer,
         address[] memory targets,
         uint256[] memory values,
         string[] memory signatures,
@@ -194,7 +192,6 @@ abstract contract GovernorCompatibilityBravo is IGovernorTimelock, IGovernorComp
 
         ProposalDetails storage details = _proposalDetails[proposalId];
         if (details.descriptionHash == bytes32(0)) {
-            details.proposer = proposer;
             details.targets = targets;
             details.values = values;
             details.signatures = signatures;
@@ -228,12 +225,12 @@ abstract contract GovernorCompatibilityBravo is IGovernorTimelock, IGovernorComp
         )
     {
         id = proposalId;
+        proposer = proposalProposer(proposalId);
         eta = proposalEta(proposalId);
         startBlock = proposalSnapshot(proposalId);
         endBlock = proposalDeadline(proposalId);
 
         ProposalDetails storage details = _proposalDetails[proposalId];
-        proposer = details.proposer;
         forVotes = details.forVotes;
         againstVotes = details.againstVotes;
         abstainVotes = details.abstainVotes;

contracts/governance/extensions/GovernorVotesQuorumFraction.sol

@@ -16,8 +16,6 @@ import "../../utils/math/SafeCast.sol";
 abstract contract GovernorVotesQuorumFraction is GovernorVotes {
     using Checkpoints for Checkpoints.Trace224;
 
-    uint256 private _quorumNumerator; // DEPRECATED in favor of _quorumNumeratorHistory
-
     /// @custom:oz-retyped-from Checkpoints.History
     Checkpoints.Trace224 private _quorumNumeratorHistory;
 
@@ -38,7 +36,7 @@ abstract contract GovernorVotesQuorumFraction is GovernorVotes {
      * @dev Returns the current quorum numerator. See {quorumDenominator}.
      */
     function quorumNumerator() public view virtual returns (uint256) {
-        return _quorumNumeratorHistory._checkpoints.length == 0 ? _quorumNumerator : _quorumNumeratorHistory.latest();
+        return _quorumNumeratorHistory.latest();
     }
 
     /**
@@ -47,9 +45,6 @@ abstract contract GovernorVotesQuorumFraction is GovernorVotes {
     function quorumNumerator(uint256 timepoint) public view virtual returns (uint256) {
         // If history is empty, fallback to old storage
         uint256 length = _quorumNumeratorHistory._checkpoints.length;
-        if (length == 0) {
-            return _quorumNumerator;
-        }
 
         // Optimistic search, check the latest checkpoint
         Checkpoints.Checkpoint224 memory latest = _quorumNumeratorHistory._checkpoints[length - 1];
@@ -105,15 +100,6 @@ abstract contract GovernorVotesQuorumFraction is GovernorVotes {
         );
 
         uint256 oldQuorumNumerator = quorumNumerator();
-
-        // Make sure we keep track of the original numerator in contracts upgraded from a version without checkpoints.
-        if (oldQuorumNumerator != 0 && _quorumNumeratorHistory._checkpoints.length == 0) {
-            _quorumNumeratorHistory._checkpoints.push(
-                Checkpoints.Checkpoint224({_key: 0, _value: SafeCast.toUint224(oldQuorumNumerator)})
-            );
-        }
-
-        // Set new quorum for future proposals
         _quorumNumeratorHistory.push(SafeCast.toUint32(clock()), SafeCast.toUint224(newQuorumNumerator));
 
         emit QuorumNumeratorUpdated(oldQuorumNumerator, newQuorumNumerator);

contracts/token/ERC20/extensions/ERC20Permit.sol

@@ -23,14 +23,6 @@ abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712, Nonces {
     // solhint-disable-next-line var-name-mixedcase
     bytes32 private constant _PERMIT_TYPEHASH =
         keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
-    /**
-     * @dev In previous versions `_PERMIT_TYPEHASH` was declared as `immutable`.
-     * However, to ensure consistency with the upgradeable transpiler, we will continue
-     * to reserve a slot.
-     * @custom:oz-renamed-from _PERMIT_TYPEHASH
-     */
-    // solhint-disable-next-line var-name-mixedcase
-    bytes32 private _PERMIT_TYPEHASH_DEPRECATED_SLOT;
 
     /**
      * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`.