- Imagine we have existing partially filled order = 10 / 100 contracts are filled, so order-state is PartFilled.
- Now I call ChangeOrder(...) on this order with new quantity15 and same prices.
Now, when I call order.Filled - what value I get?
a) Filled == 10 contracts remains, because only unfilled part of the order was modified, but it is still the same order that holds its original values
b) Filled == 0, because changing the order completely replaced the order for new one
Which one is right a) or b) ?
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