fee has been charged twice.

[bubble501]

In the trade method of Arbitrator, it seems like the fee has been charged twice
$buyPrice = $source->addFeeToPrice( $tradeAmount * $bestBuyRate, $tradeable, $currency );
$boughtAmount = $source->deductFeeFromAmountBuy( $tradeAmount, $tradeable, $currency );
for example, I buy ETH/BTC with rate 0.01, amount 100 and fee rate 0.001, I will pay 1.001BTC to get 99.9 ETH according the code.

but in practice , i wil only pay 1 BTC for 99.9ETH.