pub fn batch_update_instruction(
market: &Pubkey,
payer: &Pubkey,
trader_index_hint: Option<DataIndex>,
cancels: Vec<CancelOrderParams>,
orders: Vec<PlaceOrderParams>,
base_mint_opt: Option<Pubkey>,
base_mint_token_program_opt: Option<Pubkey>,
quote_mint_opt: Option<Pubkey>,
quote_mint_token_program_opt: Option<Pubkey>,
) -> Instruction