[issue13742] Add a key parameter (like sorted) to heapq.merge

[Raymond Hettinger]

Raymond Hettinger added the comment:

Attaching a rough draft implementation for a fully encapsulated Heap() class that is thread-safe, supports minheaps and maxheaps, and efficiently implements key-functions (called no more than once per key).

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Added file: http://bugs.python.org/file29578/heap.diff

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