pub(super) fn effective_modify_order_fields(
market: TrdMarket,
qty: Option<f64>,
price: Option<f64>,
) -> ModifyOrderEffectiveFieldsExpand description
Computes the values that C++ actually sends to the real backend.
Ref: APIServer_Trd_ModifyOrder.cpp:324-343 first normalizes API qty/price;
NNProto_Trd_OrderOpReal.cpp:543-569 then emits non-futures prices with four
decimals, futures with nine, Prediction qty with two, and ordinary qty as i64.