static VISITOR_REPLY_COUNTER: std::sync::atomic::AtomicU64 = std::sync::atomic::AtomicU64::new(1);
static VISITOR_CHANNELS: std::sync::LazyLock<std::sync::Mutex<std::collections::HashMap<u64, std::sync::mpsc::SyncSender<Option<String>>>>> =
    std::sync::LazyLock::new(|| std::sync::Mutex::new(std::collections::HashMap::new()));
