input: from typing import List, Dict
  
  
  def store_item_to_dict(items: List[StoreItem]) -> List[Dict]:
      """ Convert a list of StoreItem objects to a list of dictionaries.
      >>> item1 = StoreItem(1, 'Laptop', 1200.0, 'High-performance laptop')
      >>> item2 = StoreItem(2, 'Smartphone', 800.0, 'Latest model smartphone')
      >>> store_item_to_dict([item1, item2])
      [{'item_id': 1, 'name': 'Laptop', 'price': 1200.0, 'description': 'High-performance laptop'}, 
       {'item_id': 2, 'name': 'Smartphone', 'price': 800.0, 'description': 'Latest model smartphone'}]
      """
output:     return [{'item_id': item.item_id, 'name': item.name, 'price': item.price, 'description': item.description} for item in items]