I noticed an issue how taxes and discount is applied over multiple tax rates.
I am using two tax rates (for Canada GST+PST(regular) and GST(PST exempt products).
When adding PST exempt items to cart, discount is calculated from the total correctly. Next PST exempt product tax is calculated without discount. Discounted amount is applied to remaining balance (with no other products in cart that is only shipping). GST+PST tax is calculated from remaining balance as if only regular tax items were discounted. If shipping (or total balance with regular tax items) is less than discounted amount, I get negative tax.
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