When it's exact in, partial fill, this will be amount_in. When it's exact out, this will be amount_out
When it's exact in, partial fill, this will be minimum_amount_out. When it's exact out, this will be maximum_amount_in
Swap mode, refer [SwapMode]
When it's exact in, partial fill, this will be amount_in. When it's exact out, this will be amount_out