QuotaExceededError: The quota has been exceeded on iOS

Hello, Using nanostores + persistent to store cart data for an e-commerce website and intermittently seeing the `QuotaExceededError: The quota has been exceeded.` error on iOS + Safari. In our case, this seemingly prevents writing to the `cart` store and people are unable to add products to their cart which is not good. My questions are: 1. What causes this issue? Is it a space limitation? Or too many requests to the store? Something else? 2. How can I fix it? There was a previous issue https://github.com/nanostores/persistent/issues/7 that I'm not sure is related but that is listed as `fixed`. Any insight here would be appreciated. Thanks!