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use set instead of map for ttl instances holder by Collections.newSetFromMap https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#newSetFromMap-java.util.Map- Merge pull request #95 from fxleyu/master
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use set instead of map for ttl instances holder by Collections.newSetFromMap https://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#newSetFromMap-java.util.Map- Merge pull request #95 from fxleyu/master