Comply with new restrictions on explicit type conversions

packages/contracts/contracts/libraries/constants/Lib_PredeployAddresses.sol

@@ -10,6 +10,7 @@ library Lib_PredeployAddresses {
     address internal constant L1_MESSAGE_SENDER = 0x4200000000000000000000000000000000000001;
     address internal constant DEPLOYER_WHITELIST = 0x4200000000000000000000000000000000000002;
     address payable internal constant OVM_ETH = 0xDeadDeAddeAddEAddeadDEaDDEAdDeaDDeAD0000;
+    // solhint-disable-next-line max-line-length
     address internal constant L2_CROSS_DOMAIN_MESSENGER = 0x4200000000000000000000000000000000000007;
     address internal constant LIB_ADDRESS_MANAGER = 0x4200000000000000000000000000000000000008;
     address internal constant PROXY_EOA = 0x4200000000000000000000000000000000000009;

packages/contracts/contracts/libraries/rlp/Lib_RLPReader.sol

@@ -403,7 +403,7 @@ library Lib_RLPReader {
             "Invalid RLP address value."
         );
 
-        return address(readUint256(_in));
+        return address(uint160(readUint256(_in)));
     }
 
     /**

packages/contracts/contracts/libraries/utils/Lib_Bytes32Utils.sol

@@ -75,6 +75,6 @@ library Lib_Bytes32Utils {
             bytes32
         )
     {
-        return bytes32(uint256(_in));
+        return bytes32(uint256(uint160(_in)));
     }
 }

packages/contracts/contracts/test-helpers/TestERC20.sol

@@ -45,7 +45,7 @@ contract TestERC20 {
     }
 
     function transferFrom(address from, address to, uint256 value) external returns (bool) {
-        if (allowance[from][msg.sender] != uint(-1)) {
+        if (allowance[from][msg.sender] != type(uint).max) {
             allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
         }
         _transfer(from, to, value);