def stats
      if (s = size) > 0
        now = Time.now.to_i
        {
          "local total" => s,
          "local max age" => RightSupport::Stats.elapsed(now - @cache[@lru.first])
        }
      end
    end
def stats
      if (s = size) > 0
        now = Time.now.to_i
        {
          "local total" => s,
          "local max age" => RightSupport::Stats.elapsed(now - @cache[@lru.first])
        }
      end
    end
Get local cache statistics

 === Return
 stats(Hash|nil):: Current statistics, or nil if cache empty
   "local total"(Integer):: Total number in local cache, or nil if none
   "local max age"(String):: Time since oldest local cache entry created or updated