SEND

    pub const SEND = packed struct(integer_t) {
        /// Other flags are only valid if this one is set.
        MSG: bool = true,
        _1: u3 = 0,
        TIMEOUT: bool = false,
        OVERRIDE: bool = false,
        INTERRUPT: bool = false,
        NOTIFY: bool = false,
        _8: u1 = 0,
        /// Shared between `RCV` and `SEND`.
        STRICT_REPLY: bool = false,
        _10: u6 = 0,
        /// User-only. If you're the kernel, this bit is `MACH_SEND_ALWAYS`.
        FILTER_NONFATAL: bool = false,
        TRAILER: bool = false,
        /// Synonymous to `MACH_SEND_NODENAP`.
        NOIMPORTANCE: bool = false,
        /// Kernel-only.
        IMPORTANCE: bool = false,
        SYNC_OVERRIDE: bool = false,
        /// Synonymous to `MACH_SEND_SYNC_USE_THRPRI`.
        PROPAGATE_QOS: bool = false,
        /// Kernel-only.
        KERNEL: bool = false,
        SYNC_BOOTSTRAP_CHECKIN: bool = false,
        _24: u8 = 0,
    }