std::map<std::string, unit::state_t> unit::get_known_boolean_state_names()
{
    return {
        {"slowed",     STATE_SLOWED},
        {"poisoned",   STATE_POISONED},
        {"petrified",  STATE_PETRIFIED},
        {"uncovered",  STATE_UNCOVERED},
        {"not_moved",  STATE_NOT_MOVED},
        {"unhealable", STATE_UNHEALABLE},
        {"guardian",   STATE_GUARDIAN},
    };
}