Jason Evans fd058f572b Immediately purge cached extents if decay_time is 0.
This fixes a regression caused by
54269dc0ed3e4d04b2539016431de3cfe8330719 (Remove obsolete
arena_maybe_purge() call.), as well as providing a general fix.

This resolves #665.
2017-03-02 19:43:06 -08:00
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