Key and value are inverted in PriorityQueue

[dpsanders]

Usually the keys as the priorities and the values as the associated data.
This seems to correspond to other data structures, which are sorted / arranged by key, not by value.

[oxinabox]

PriorityQueue IMO should not even subtype AbstractDictionary
#690

To me a priority queue is a queue with a special insertion function that inserts part way down

[hdavid16]

Usually the keys as the priorities and the values as the associated data.

This seems to correspond to other data structures, which are sorted / arranged by key, not by value.

The issue with this is that you couldn't have two items with the same priority in the queue.