@Override
  public int nextOffset() {
    return Math.toIntExact(currentPayloadOffset);
  }
Enters the list, but does not return the number of item of the entered list. This prevents
bouncing all around the file to read values that are probably not even used.

@see #enterList()
@param skipCount true if the element count is not required.
@return -1 if skipCount==true, otherwise, the number of item of the entered list.
ethereum/rlp/src/main/java/org/hyperledger/besu/ethereum/rlp/AbstractRLPInput.java