title: How to change line item id - Shopify Ajax cart
body: <p>The default line item id is the variant id, which for me is not unique enough (there are some properties which change for the same variant).
  How does one override the line item ID?</p>
  
  <p>I tried changing <code>data-id</code> attribute directly in my <code>cart.liquid</code> template but no success.</p>
  
  <p>I want to be able to provide a hashed string, such as <code>S32FDA</code> for the line item id.</p>