fix: Stricter RLP boolean checking (#343)

Co-authored-by: Maurelian <maurelian@protonmail.ch>

packages/contracts/contracts/optimistic-ethereum/libraries/rlp/Lib_RLPReader.sol

@@ -353,6 +353,11 @@ library Lib_RLPReader {
             out := byte(0, mload(ptr))
         }
 
+        require(
+            out == 0 || out == 1,
+            "Lib_RLPReader: Invalid RLP boolean value, must be 0 or 1"
+        );
+
         return out != 0;
     }
 

packages/contracts/test/data/json/libraries/rlp/Lib_RLPReader.test.json

@@ -16,6 +16,12 @@
                 "out": [
                     false
                 ]
+            },
+            "something other than 0 or 1 (should revert)": {
+                "in": [
+                    "0x02"
+                ],
+                "revert": true
             }
         },
         "readAddress": {