The seeded bug: pricing.js applies every coupon
against the subtotal twice — try SAVE10 and watch
a 10% coupon take 20% off. The fix is replacement code, hot-swapped
into this running page by a signed module patch. Your cart is state in
a different module: it survives the swap.
Free shipping over $150. Adjust quantities, apply the coupon, and keep the page open while the patch ships.
Connected — waiting for signed module patches over WebSocket.