[MERGE] Use a dict for Btree internal nodes instead of LRU

[Robert Collins]

On Fri, 2009-03-27 at 03:28 +0000, Matt Nordhoff wrote:


> If it's really unlikely that the cache will be filled, but you don't
> want the performance cost of an LRUCache, why not compromise and use a
> FIFOCache?

Sure.

-Rob
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