message: Optimize loop iterator.
diff: @@ -203,7 +203,7 @@ library Lib_MerkleTree {
  // Borrowed with <3 from https://github.com/ethereum/solidity-examples
  uint256 val = _in;
  uint256 highest = 0;
  - for (uint8 i = 128; i >= 1; i >>= 1) {
  + for (uint256 i = 128; i >= 1; i >>= 1) {
  if (val & (uint(1) << i) - 1 << i != 0) {
  highest += i;
  val >>= i;
  