[Bug]: Paper API - quantity in opened position is not the same as requested in market order

Is there an existing issue for this?

[X] I have searched the existing issues

Current Behavior

When I open an order, the filled quantity is slightly less then the one requested. This issue also happens when performing a HTTP rest call directly.

For example, opening BUY 0.1 BTCUSD will result in 0.09975 quantity.

Expected Behavior

After opening order, quantity on position should be exact as requested. After opening BUY 0.1 BTCUSD, the position should have exactly 0.1 quantity.

SDK Version I encountered this issue in

alpaca-py==0.13.1

Steps To Reproduce

1. trigger a market order BUY with 0.1 qty 
2. verify quantity in account position

Code: 

import alpaca.trading.client
import alpaca.trading.requests
import alpaca.trading.enums

trading_client = alpaca.trading.client.TradingClient(
    'xxxx', 'yyyyyyy', paper=True)

# preparing market order
market_order_data = alpaca.trading.requests.MarketOrderRequest(
    symbol="BTCUSD",
    qty=0.1,
    side=alpaca.trading.enums.OrderSide.BUY,
    time_in_force=alpaca.trading.enums.TimeInForce.GTC
)

# Market order
market_order = trading_client.submit_order(
    order_data=market_order_data
)

Filled out the Steps to Reproduce section?

[X] I have entered valid steps to reproduce my issue or have attached a minimally reproducible case in code that shows my issue happening; and understand that without this my issue will be flagged as invalid and closed after 30 days.

alpacahq / alpaca-py

[Bug]: Paper API - quantity in opened position is not the same as requested in market order #374