test-pr #32
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Extracted from bitcoin#33141 (comment). In Python, list `pop(0)` is linear, so consuming all items is quadratic. Switched to `collections.deque` with `popleft()` to express FIFO intent and avoid the O(n^2) path. Behavior is unchanged; for a few hundred items the perf impact is likely negligible. Ref: https://docs.python.org/3/tutorial/datastructures.html#using-lists-as-queues > While appends and pops from the end of list are fast, doing inserts or pops > from the beginning of a list is slow (because all of the other elements have > to be shifted by one).
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