With the new update cart callback system in place you can now update the quantity of items in the cart in bulk. Simply pass the item key and the quantity for each item you wish to change and the quantity of those items will update.
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For all snippets that could be of use to tweak or customise CoCart.
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What you see when you return the cart contents is how WooCommerce formats the data. However, via the REST API this particular key is not a requirement.
As the only feature in CoCart that does not use the REST API, some developers requested that they have the option to disable it.
With API v2 of CoCart, the totals are not formatted automatically as per users feedback but for some, they wanted to keep it the same as before.