Function order_book_read_uses_requested_count 

pub fn order_book_read_uses_requested_count(
    info: &CachedSecurityInfo,
    qr: &QotRightData,
) -> bool

C++ GetOrderBook read path skips GetOrderBookMaxNum clipping for HK SF and US TotalView Lv2.

Ref:

• FutuOpenD/Src/APIServer/Business/Quote/APIServer_Qot_OrderBook.cpp:86-89
• FutuOpenD/Src/APIServer/APIServer_Inner_API.cpp:900-929