Constant cumulus_primitives_core::relay_chain::ON_DEMAND_MAX_QUEUE_MAX_SIZE

pub const ON_DEMAND_MAX_QUEUE_MAX_SIZE: u32 = 1_000_000_000; // 1_000_000_000u32

Maximum for maximum queue size.

Setting on_demand_queue_max_size to a value higher than this is unsound. This is more a theoretical limit, just below enough what the target type supports, so comparisons are possible even with indices that are overflowing the underyling type.