code: public ByteArray getBeanIdArray()
      {
          int beanIdLength = data.length - ivBeanIdIndex;
          byte[] beanIdBytes = new byte[beanIdLength];
          System.arraycopy(data, ivBeanIdIndex, beanIdBytes, 0, beanIdLength);
          return new ByteArray(beanIdBytes);
      }
docs: Returns a ByteArray containing the serialized BeanId that corresponds
  to this WrapperId instance. <p>