private RLPException error(final Throwable cause, final String msg, final Object... params) {
    throw new RLPException(errorMsg(msg, params), cause);
  }
Sets the input to the item provided (an offset to the beginning of an item) and check this is
valid.

@param item the value to which the current item is to be set.
ethereum/rlp/src/main/java/org/hyperledger/besu/ethereum/rlp/AbstractRLPInput.java