Method code for $mutex.cleanup_dead_tasks()

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var t, i, j;

t = tasks();
for i in (tasks.keys()) {
    if (!(i in t)) {
        for j in (tasks[i])
            ._del_from_lock(i, j);
        tasks = tasks.del(i);
    }
}

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["// Created 11-Mar-1997 as a part of ColdCore, see: @help Credit"]