If the reserve token is fee-to-transfer token and the user is buying ohm, the Operator::swap will incorrectly assume the amountIn_ value is transferred, which fails to consider the fees. If the fee is rounded up, the attacker can purchase ohm without giving any assets to the treasury. It may not be profitable for the attacker, but it may cause devaluing of the ohm. However, the loss will be limited to the capacity.
