evm: Fix minor issues from PR#4 (#15)

evm/src/NttManager/ManagerBase.sol

@@ -218,7 +218,9 @@ abstract contract ManagerBase is
     function transferOwnership(
         address newOwner
     ) public override onlyOwner {
-        // TODO: Just delete this function and let the Ownable one be called directly?
+        // It's intentional (at this time) that we are not transferring the endpoint admin.
+        // The endpoint functions are all called by the NttManager, which means the admin
+        // must remain the NttManager.
         super.transferOwnership(newOwner);
     }
 
@@ -354,6 +356,7 @@ abstract contract ManagerBase is
         assert(this.mode() == mode);
         assert(this.chainId() == chainId);
         assert(this.endpoint() == endpoint);
+        assert(this.executor() == executor);
     }
 
     function _checkThresholdInvariants() internal view {

evm/src/NttManager/NttManager.sol

@@ -656,12 +656,13 @@ contract NttManager is INttManager, RateLimiter, ManagerBase {
             args.amount.untrim(tokenDecimals()),
             args.epTotalPriceQuote,
             args.recipientChain,
-            args.sequence,
-            payloadHash
+            args.sequence
         );
 
         uint128 gasLimit = peerData.gasLimit;
         if (gasLimit == 0) {
+            // The gas limit can only be zero when a contract has been migrated from an older version,
+            // where the gasLimit was not defined in the manager peer struct and was not set during the upgrade.
             revert InvalidGasLimitZero(args.recipientChain);
         }
 

evm/src/interfaces/INttManager.sol

@@ -18,7 +18,7 @@ interface INttManager is IManagerBase {
 
     /// @notice Emitted when a message is sent from the nttManager.
     /// @dev Topic0
-    ///      0x75eb8927cc7c4810b30fa2e8011fce37da6da7d18eb82c642c367ae4445c3625.
+    ///      0xe54e51e42099622516fa3b48e9733581c9dbdcb771cafb093f745a0532a35982.
     /// @param recipient The recipient of the message.
     /// @param refundAddress The address on the destination chain to which the
     ///                      refund of unused gas will be paid
@@ -32,8 +32,7 @@ interface INttManager is IManagerBase {
         uint256 amount,
         uint256 fee,
         uint16 recipientChain,
-        uint64 msgSequence,
-        bytes32 msgHash
+        uint64 msgSequence
     );
 
     /// @notice Emitted when a message is sent from the nttManager.

evm/src/libraries/TransceiverHelpers.sol

@@ -32,15 +32,3 @@ function countSetBits(
 
     return count;
 }
-
-// @dev Count the number of set bits in a uint128
-function countSetBits128(
-    uint128 x
-) pure returns (uint8 count) {
-    while (x != 0) {
-        x &= x - 1;
-        count++;
-    }
-
-    return count;
-}

evm/test/libraries/TransceiverHelpers.sol

@@ -206,11 +206,11 @@ library TransceiverHelpersLib {
         for (uint256 idx = 0; idx < events.length; ++idx) {
             if (
                 events[idx].topics[0]
-                    == bytes32(0x75eb8927cc7c4810b30fa2e8011fce37da6da7d18eb82c642c367ae4445c3625)
+                    == bytes32(0xe54e51e42099622516fa3b48e9733581c9dbdcb771cafb093f745a0532a35982)
                     && events[idx].emitter == nttManager
             ) {
-                (,,, uint64 sequence,) =
-                    abi.decode(events[idx].data, (uint256, uint256, uint16, uint64, bytes32));
+                (,,, uint64 sequence) =
+                    abi.decode(events[idx].data, (uint256, uint256, uint16, uint64));
 
                 if (sequence == nttSeqNo) {
                     // The next event in the log should be from the executor