docs: def sub_pi_to_number(self, subpage=1, subitem=1):
          """
      Convert subpage & subitem to a integer
  
      * if page == 1, then return 0, since the item count is the true # of items
      * if page == 2, then return, page-1 * items_per_page, since we are
        returning the # of items on a full page.
  
      Args:
          * None
  
      Returns:
          * Integer - Which represents the number of items up to the page.
          """
          if subitem == None:
              subitem = 0
  
          if subpage == None:
              return 0
          else:
              if subpage > 1:
                  return ((subpage - 1) * self.subpage_items) + subitem
              else:
                  return 0 + subitem