FastQueue doesn't return some nodes in some cases about high-speed-priority-queue-for-c-sharp HOT 3 CLOSED

You're not dequeuing every node in the queue, so that test shouldn't necessarily be expected to pass...

As mentioned in the documentation, FastPriorityQueue is not stable, meaning if multiple nodes have the same priority, the order they're dequeued is arbitrary. If you need a stable queue, use StablePriorityQueue instead.

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As mentioned in the documentation, FastPriorityQueue is not stable, meaning if multiple nodes have the same priority, the order they're dequeued is arbitrary. If you need a stable queue, use StablePriorityQueue instead.

But it means
We have not stable lib. See docs. :)

You can change this behavior. Fast method is change all usings HasHigherPriority to HasHigherOrEqualPriority in CascadeDown method.
You can try.

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No, that is not sufficient to make the data structure stable.

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