v1.2.1

Fixed

• Products.find() couldn't look up a product by SKU, even though the store has always supported it. You could already look up a product by its numeric ID or by its SKU, but the SDK's TypeScript types only allowed a number, so find('PCT-2024') wouldn't even compile. Fixed — find() now accepts a SKU as well as a numeric ID.
• Adding an item to the cart by SKU used to be rejected before the request was even sent. The store has always accepted a SKU (like 'BLUE-SHIRT-L') as well as a numeric product ID when adding an item to the cart, but the SDK's own input checks were stricter than that and blocked anything that wasn't a plain number — so a valid SKU never got the chance to reach the server. This is now fixed for addItem(), addVariation(), and the main product in addItems(). Note: the individual products inside an addItems() group still need to be numeric IDs, not SKUs.