Use deque for O(1) cache eviction#13
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- Replace list with collections.deque for _order tracking — popleft() is O(1) vs list.pop(0) which is O(n) - Move contextlib import to module level instead of inside _evict() Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
listwithcollections.dequefor cache eviction order —popleft()is O(1) vslist.pop(0)which is O(n)contextlibimport to module level (was inside_evict())Test plan
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