--- token/ERC20/extensions/ERC20Votes.sol	2023-04-27 13:16:53.923627178 +0200
+++ token/ERC20/extensions/ERC20Votes.sol	2023-04-27 13:27:00.856088231 +0200
@@ -281,10 +281,11 @@
     /**
      * @dev Access an element of the array without performing bounds check. The position is assumed to be within bounds.
      */
-    function _unsafeAccess(Checkpoint[] storage ckpts, uint256 pos) private pure returns (Checkpoint storage result) {
-        assembly {
-            mstore(0, ckpts.slot)
-            result.slot := add(keccak256(0, 0x20), pos)
-        }
+    function _unsafeAccess(Checkpoint[] storage ckpts, uint256 pos) private view returns (Checkpoint storage result) {
+        return ckpts[pos]; // explicit (safe) for formal verification hooking
+        // assembly {
+        //     mstore(0, ckpts.slot)
+        //     result.slot := add(keccak256(0, 0x20), pos)
+        // }
     }
 }