Where is the PriorityQueue in pathfinding

Beginner Questions
#1

I need the structure of PriorityQueue which Unity did not provide. I guess A* Pathfinding pro has used the PriorityQueue for pathfinding, but can not find it.

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#2

several days ago I found the TinyJson in A* pathfinding pro which is very useful.

#3

I did find one at Github: GitHub - BlueRaja/High-Speed-Priority-Queue-for-C-Sharp: A C# priority queue optimized for pathfinding applications. but do not want to add too many packages in my project if A* pathfinding has already provided one

#4

It’s in the file BinaryHeap.cs.