Jason Evans 4a346f5593 Replace rtree path cache with LRU cache.
Rework rtree_ctx_t to encapsulate an rtree leaf LRU lookup cache rather
than a single-path element lookup cache.  The replacement is logically
much simpler, as well as slightly faster in the fast path case and less
prone to degraded performance during non-trivial sequences of lookups.
2017-02-08 18:50:03 -08:00
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