Constant polkadot_parachain_primitives::primitives::MAX_UPWARD_MESSAGE_NUM

pub const MAX_UPWARD_MESSAGE_NUM: u32 = _; // 16_384u32

Maximum number of UMP messages allowed per candidate.

We also use this as a generous limit, which still prevents possible memory exhaustion, from malicious parachains that may otherwise return a huge amount of messages in ValidationResult.